You're arguing from a position of logic and sober cost/benefit analysis, the right and proper way for people to make a decision. I'm saying that the majority of humanity, and frankly the majority of the other ME races, don't necessarily make decisions based on those criteria. To these people, Revy is stealing away humanity and the other races's rights to eventually die, as is the natural order, and go live with their sky daddy. I'm not saying there will be protests and official condemnation; I'm saying there will be radical militants out for Revy's head, and waves of suicide bombers, and a Council who won't want to get near Revy and Paragon Industries with a 10 light-year pole.
To these people, Revy is stealing away humanity and the other races's rights to eventually die
One word: Euthanasia
Longer explanation: The Asari will be happy to finally have fixed part of the cause for the shortsightedness of the other races, the salarian have no known religion and have shown a clear rationalist tendency, the Krogan couldn´t care less, The Qurian and Drell sing our praises once we fix their medical and economical problems and the Turian/Elcos follow their leaders (who are the ones who will benefit most from a longer life)
And even in humanity the religious make a significant minority who already accept genemodding, invitro inspection etc. as natural.
Hell we simply avoid the word immortality, which is reasonable since we can´t know that for 100% without living through it, and market it as an increased lifespan which is something I don´t have noticed any protest occurring.
And it is not like we will make such a treatment mandatory in the whole galaxy, the nutjobs are always free to leave.