I doubt many will be happy even if it's the greatest and most revolutionary forum software to have ever been created. Would you be happy shelling out £64k for it?
I think whenever it arrives it'll seem disappointing because it's been hyped and in the making for so long, though I'm looking forward to it.
If I donated 50 BTC out of my hypothetical stash of 5000 BTC I could possibly let it slide haha.
It would be nice if the donators got back their share of the remaining funds raised back. But I doubt that would happen, or how they might even go about doing such a thing.
I don't expect any return on any donation I've ever contributed, to this forum or otherwise. Once I send the funds, they no longer belong to me but to the recipient to do with as they wish. If I'm unhappy with how they spend them, that just means I should have done more to insure they would be handled in an appropriate manner.