User blog comment:Kaloneous/Mass Effect 3 Ending DLC Denied and PAX/@comment-2250460-20120326210758/@comment-118213-20120327155634

I would love to say I shared your disappointment in Destroy (being the best of the worst) not allowing Synthetics to live, but for reasons I can't understand when it came to Rannoch I could only choose between the Geth and the Quarians, and obviously I'm gonna pick the Quarians - perhaps it's because I gave Legion to Cerberus in ME2.

But the Starchild does say "you can wipe out all synthetic life if you want" - which does imply before hand that EDI and the Geth won't survive. As you say it's catch 22.