Hi,
I think the Phantom II has been replaced in "important" air forces only with economic reasons... Manufacturers have to sell their new products. That is the case in France with the "Rafale" which, in the absolute, was unnecessary. It should have been better to improve the Mirage 2000 (and that was possible). The only need for a new plane was for the French navy, but the French government didn't want to buy planes coming from the USA... Politics !
Jicehem