Decades, not ‘soon’.
The Problem is The U.S. Really has NO idea what type of enemy aircraft we will face in the Immediate future anymore then we did when we found out the North Koreans had MIG 15’s after they shot the hell out of our B-29’s and Subsonic fighters of the era.
But this time, we’ll know that the Russkies, Chicoms or some other enemy in the future we’d face will be equipped with the latest Flankers and PAK FAs.
So, planning ahead and massively spending and dedicating to a weapons programs isn't that productive.