Scenarios to up-end the RCS calculation might include a few like this:
1) Stealth is based in part on geometry: they slant the surfaces to get over the Bragg Angle for the types of radiation that they anticipate, and try to keep the waves bouncing inside once captured, using coatings (I think..). The RCS is huge if you could be looking sideways/downward, for instance.
Ha! u say. How u gonna park at 40,000 feet?
Answer: By investing in 400% Carbon Reduction Initiatives.
Park a few Stratospheric Platforms at 40K -50K feet, powered by the sun. Suddenly, Stealth a/c become very visible many miles out.
With some protection, of course, but those platforms now become fighter-directors.
Sure, those can be "taken out" but its another step to take b4 ur 'surprise' sortie.
2) Rain etc kill mmwave.
Not so fast. Again, the radar "tower" can be located in a tethered aerostat at 12-15,000 m. Such tethered things already exist for other purposes. So now the mm wave is again looking sideways/downwards from above the clouds, and the mmwaves can even be generated at ground level and sent up through waveguides in the tethers. Vaporware, u say? Well.. such waveguides already exist, can be bought from General Atomics website, for instance. Used for fission/fusion 'research'.
Note that rain etc also deter those Stealth fighter sorties using the Wobblin' Goblins, most of the time. The hyooman pilot, between episodes of vomiting, will be trying to get the windshield viper operating and wiping inside the windshield with her embroidered handkerchief.
3) Yes, it's a huge investment. But every Defense service all over the Duniya has looked at what happened to Saddam and his Imperial Guard and his vaunted Air Fauj. Same at Serbia, and said:
There but for the grace of ATM go I!
Surely they have been looking at the implications for their own ability to stay independent and be able to say

to Dubya and Cheney? If u were Defense Mantri and the baksheesh were the same either way, would u invest in imports of big fighter planes, or lots of small imports of certain electronic components? Its been 25 years since Desert Shield etc. Not everyone is as stupid as they appear, hain? Some of what is displayed in Ukraine is pretty awesome in targeting precision, and they probably have good detection as well. I think they have come a long way since the Berlin Wall came down, in terms of digital electronics. They have always been good at mmwave and lasers.
4) Faced with huge US technical superiority using these immensely expensive systems, what would a good strategist do? (say India..)
a) Distribute your detection assets so that they can't be 'taken out' in 24 hours or air raids. Lots of Ambassador cars, bullock carts, maybe 'Gajendra' elephant-borne radar?
b) Distribute your SAMs. Point defense is a terrible idea.
c) Reduce dependence on grid-based power.
d) Vary your technology and standardization,
e) Distribute and empower rather than concentrate C^3 so that one leak of circuit diagrams and codes doesn't kill you.
f) Convert communications to fiber-optic plus innovative last-mile options, so that they can't hack or knock out your C^3.
So the US pouring all resources into one 1990s Bright Idea for the next 30 years suddenly looks not-so-hot.
So I don't believe that will happen. These days, any program that sticks it's head up above the $40B mark (LHX estimate, 1980s) just does the equivalent of the legendary Kabir sitting out on the tree... Target #1 for cuts.
Which is why, I think the F-35 proponents are so insecure.
We have met the Enemy..
And he is Common Sense.
The other side of all this is that for the Inferior Ones, being able to SEE an incoming US aircraft is no comfort if one cannot hit it. So they would also be investing heavily in hypersonic weapons such as kinetic-kill, or hypersonic cruise missiles. I don't see what an F-35 can do against those - only the Air Force version has even one cannon. Do they have Force Fields I wonder.
Detect one of those noisy engines with the signature of the counter-rotating turbomachines zooming overhead at Mach 1.6 ... automatic launch of hypersonic kinetic-kill chase missiles, reaching Mach 7. Hundreds of them.