Plane zoo is about to get much much smaller in the coming decades. MiG-21's will be gone, eventually Jaguars, Mirages & MiG-29's will all be gone too.
Then it's just LCA family (incl ORCA, if it happens), Rafale, Su-30 MKI, and AMCA (+ any Su-57's). Not too bad.
Re: issues with Su-57. It's...