Dude your examples are just silly. Both the ME262 and tiger were rushed into service because of a losing war and they still dominated their engagements. It's a good thing their cities were being firebombed night and day with pressure from the english and the soviets. If germany had any economy left at those stages (and weren't losing) those weapons could of changed the tide of war.
Better examples of expensive crap that does nothing are nuclear weapons and battleships. Good thing is one of those are already gone and the other is being reduced.
On topic, canceling the planes is no big deal. For our current wars F-15s and A-10s are fine. If russia/china start ramping up arms production then you can start ordering your uber-aircraft again (no other country with an air force would be hostile). There are enough F-22s for our current operations.

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