*To the comment above about adding Next War to Wolfshanze or Merged Mod, please don't. ...
My thought is that Stealth Bombers should then be extremely expensive to build, maybe have the same cost as a National Wonder, or only be buildable by a city with the National Wonder- Skunk Works perhaps only buildable by a great engineer. This would then re-introduce jet bombers back into the modern age and make air superiority very important. It would also make Stealth Bombers themselves more unique and not buildable by every nation in the world.
I was fooling around last night with some concepts, and I might include some of them in the next version (not imminently due, mind you). It's by far similar to Next War, and certainly won't include any assault mechs or anything like that. I'm thinking about having an extra fourth generation of aircraft - so there'd be WWI, WWII, Cold War and present day airframes. This also gives some interesting choices for upgrading the light bomber. I also agree that Stealth Bombers should not become common, so I'll probably drop the upgrade from Jet Bombers to Stealth Bombers, and increase their cost. This means that if you research Stealth, you will have to build the SB's from scratch, you can't just upgrade your whole bomber fleet to those badboys.