Well, the F-22 has been in service for over 15 years. The J-20 is probably not quite an equivalent, but I wouldn't want to count on that. Su-57 numbers might be too small to matter, but again do you want to count on that? The F-35 isn't equipped to fight against a peer adversary, so you're essentially relying on the geopolitical situation to continue to be that there isn't one.