What worries me is an over an over reliance on a single platform by to many of the same allies at once. Imagine every thing starting to go to hell in a hand basket after its been in service for a while, and a sudden a problem surfaces with it that can't be ignored.
Remember this from the same stable and it worked out real fine...The mighty F-16 series once touted as the "deal of the Century" [1975] when NATO allies placed big orders and are still flying them! The type spread around the world and is still in limited production 39 years after its first flight>>
I think the F-35 and her derivatives will ultimately do fine...