No, what discredited Eugenics is that 12 million people were killed, not just that half of them happened to be Jews. The Nazis also killed the disabled, gays, Slavs, Roma, Sinti, religious dissidents, etc.
As far as not having enough Jews to go around... the ones we have cause plenty of problems.
Imagine if there was No Zionist Entity. We could have avoided 80 years of needless conflict.
Not at all.
Honestly, I wish we had EITHER Mayor Daley back, compared to the clown show the last three guys have been.