Google piled massive resources behind Google+ and look where that is.

Personally, I don't think Google will yank the cord on this entirely, but they may just stop piling resources into it and/ or significantly increase prices to ratchet up profits. They don't have to drop the whole cloud to really screw up a developers life, just screwing with one API I rely on can kill a product and they've already done exactly that.

The problem is with Google you just don't know what's going to happen. Microsoft and Amazon are both known and neither plays games with their products.