Tbf, it was probably gonna happen anyway. Fast jets cost orders of magnitude more to develop, build and maintain than they did in the mid-20th century, take decades instead of months to develop, and the Cold War has been over for 30 years so air forces have been shrinking. Not many countries maintain indigenous high-end military aircraft industries anymore because it doesn't make sense to do that unless you can guarantee a steady stream of orders to keep the production line going and offset some of the R&D costs.
Russia and China are building their own jets for obvious political reasons, but Russia can barely afford to buy its own new planes. France spent €45Bn to develop the Rafale, out of stubbornness and national pride, but it's not obviously better than the Eurofighter and worse than the F-35, and they're basically having to suck India's dick for foreign orders to keep production going. Sweden has the Gripen, which seems to be a great little plane for countries that can't afford or don't need the best military hardware, but probably not relevant to major NATO members.
Even the USAF couldn't afford to order more than 187 F-22's after all the time and money that went into that program, and the future of military aviation looks like this anyway:
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Engineering will always be important but the next big jump in aerial combat capability will be based on software engineering. Instead of the RAF only having 138 F-35's and 147 Eurofighters, with pilots who cost millions and years to train for a short career, what if they could afford 5,000 armed drones that can make decisions independently or collectively, almost at the speed of light, are politically expendable, and can be deployed at any moment as quickly as someone can press a button on a keyboard?
Lockheed Martin and BAE will still want to sell big ticket items to tame politicians and staff officers, but there's no real reason why drone swarms need to be composed of expensive high-end models. Smaller companies can get into this market too, and maybe we'll see a return to the mid-20th century situation where there were lots of different aviation firms competing.