If you guys are anything like me, you've already begun wondering what will be next for all the launch vehicle engineers at NGSS. This thread is for speculating about what that may be.
My guess is layoffs. Some people will likely move to other areas within NG, but the other NG programs are likely fully-staffed already or close to it, and some of the specialties needed for OmegA just won't be needed on other programs.
There's a lot of good, seasoned engineers who are working on OmegA. If we do see layoffs at NGSS, I wonder if we'll also see a related increase in the number of smallsat companies since that seems to be the standard retirement plan of rocket scientist nowadays.
The rumors of layoffs are greatly exaggerated.*
If/when/as the OmegA program winds down (see asterisk, we have not heard the government outbrief yet, no decisions yet on contesting the award, no announcement of off-ramp plans, etc.), it's important to remember that OmegA was always recognized as a dark horse candidate in this competition. I've read a lot of "to no one's surprise" comments regarding this outcome, just quibbling over right way the 60/40 split should have been allocated -- and of course SpaceX-or-bust fanatics who want 100/0. We put in a very compelling offering to the government, but inertia and incumbency are the dominating forces in this universe. "No one's surprise" in this context also includes company leadership, from whom we've heard words like "disappointed" but not "surprised."
Also, losing NSSL is not an existential threat to NGSS as it is for ULA. SpaceX would continue flying F9, FH and developing SH/SS; Blue would continue developing at their own pace; but for ULA this was a must-win contract. For NGSS, Space Launch is a fairly small part of the portfolio; albeit would have gotten much, much larger with an NSSL award. At Launch Vehicles, the bread and butter is in military suborbital contracts: targets (e.g. Coyote SSST) and interceptors (GMD/GBI/OBV, with NGI competition ramping up). Launch Vehicles also has the booster integration role on GBSD which is also ramping up. I also hear of programs that sound like cover names, probably in the hypersonics or counter-hypersonics realm. They would not have built a new giant, beautiful HQ facility in Chandler contingent on winning NSSL/LSP. It might be mostly vacant today, but it's been that way for 5 months due to COVID, not OmegA and LSP. At Dulles, Launch Vehicles has a fairly small presence -- most of the work there is in satellites and spacecraft. I hope my colleagues there are able to transition into current programs or new developments without personal disruption. Pegasus, Minotaur in its many varieties, even Antares have a role to play.
Similar story at Propulsion Systems -- SLS, D5 Trident II, GBSD, Orion motors, GEM 63/63XL, hypersonics, flares & decoys... I'm just talking about two business units, not even half of heritage Orbital ATK, in a megacorp that's more than an order of magnitude larger. A lot of work to go around, most of it though not in the limelight of space launch. If SLS is cancelled, there will probably be layoffs and reorgs here, but I kinda doubt there will be Yet Another Resurrection Of The Stick originating from Utah.
For some people, orbital space launch is where they want to be -- and we've lost a lot of good talent to Blue and other places (or divisions within NG) especially from the Launch Vehicles unit over time... and we've picked up some great talent too. It's an exciting time to be in this industry. The more "Space," the merrier. And although much of the work on the Liquid Upper Stage has been outsourced -- not quite to the extent that Antares first stage is outsourced --, NGSS has developed a lot of expertise in liquid engines and stages over these years. If there's an opportunity to develop a new liquid LV or stage, NGSS/LV has some very good and mature foundations to build on.
Having said all that, the company is responsible to earth-based stockholders, not space-colonist billionaires. Decisions on staffing, etc., are made with realistic forecasts... and some would say the pain of having to staff up after an NSSL win is easier to bear than the pain of downsizing after a loss. In other words, I (see asterisk) do not expect to hear of layoffs anytime soon.
For NGSS, the future may include OmegA-derived LVs, Omega/Antares hybrids, Antares upgrades/evolutions... or maybe it won't. Maybe there's something completely different on the horizon. Maybe heritage Northrop/TRW has something from the back of their catalog that will see new light. Maybe it's an exit to this segment of the market. There are also white-tail assets whose future is unknown.
Personally, I recognize that participating in the development of a Heavy-Lift launch system such as OmegA is very likely a once-in-a-generation opportunity, and I'm glad to have been a part of it from Day 0. Go OmegA!

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Opinions are my own, not authorized to speak on behalf of the company.
Edit:Finished an incomplete sentence and changed up a repetitive word or two to keep my HS Junior English teacher from marking off points on my essay.