That would be non-evil, sure. But I wonder if blind people even want it? They're already listening to screen readers at insane speeds, up to 6-8x, I think. Do they even care that it doesn't sound "realistic"?
It appears from the outside that you've decided this is Officially Bad technology and aren't genuinely seeking evidence otherwise.
There's almost no reply here with a use that is a) not somewhat bad and b) has enough of an upside to compensate the downsides.
Except maybe this one, but I do know enough about accessibility to know how blind people generally use computers, which is why I asked the question.