I do not take issue with anything you said (your opinion is as valid as mine) - up until your last sentence, which piqued my interest.

You seem to be implying that Mr Singer's "radical ideas" are weak, invalid, or beneath consideration because our society hasn't embedded them yet. I would like to respond that I think the value of a radical idea cannot, and probably should not, be measured by how well society accepts it. For example, there are a some pretty famous, radical ideas from this rabbi a couple thousand years ago that have totally failed to be embedded in our society, yet his radical ideas arguably still have significant merit. I am thinking specifically of the radical idea of kindness and peace expressed in "turning the other cheek", an idea we, as a society, have for all intents and purposes rejected.

Otherwise, I would also like to remind you that the OP just asked for ideas that blew our minds. Mr Singer's idea, when I heard it for the first time, blew mine and I thought it fit the brief.