Trump threatens allies with F47: If they buy it, it will be crap. Maybe they stop being allies (unless they buy overpriced crap).
Correct me if I'm wrong, but developing a new gen fighter like that would take a heck of a lot longer that how long Trump has left in office, or probably even to live given how old, fat and unfit he is.
Yes. And all timelines given and "development budget" will double, and betting on more than double is one I would take. Your assumptions that everyone becomes BFFs again after Trump is uncertain to me. The CIA stooges in colonies will probably be unpaid and dethroned, and so it may take a lot of time to re-establish sycophancy, assuming Trump is not successful in increasing it.