Hopefully Skunkworks or similar black budget military capabilities are continuously working on technological developments and are just not showing their hand.
That said, my faith in our country is not a stock to purchase currently.
I’m aware the F-16 has had numerous upgrades from inception.
I highly doubt that there would be anything game changing available from those facilities in time. Word has it that most of those capabilities were massively defunded around 2008-2010 (gee, I wonder why) and that the well is basically dry.
A lot of that kind of stuff got canned when the Australians discovered that you actually *can* see a stealth craft entering your territory on radar. Not well enough to get a missile lock, but well enough to vector fighters or UAVs to go say hi.
The F-16’s had a ton of upgrades and there’s been yet another round of them... which we didn’t buy.