I don't think it's that significant a loss though, if you look at double fine's kickstarter they only had 87k backers, if the game sells a couple hundred thousand after launch then that's still a significant chunk of people giving you money.
But I think it's just signalling a shift in how things are done though, doing kickstarter cuts out the middle man publisher, so now instead of being paid to develop this game and then on release the publisher and big names get the rewards, now I would assume that any money made post launch goes to the devs instead of the publisher.
I don't know, I've always been curious how big development studios handle sales, I assume it all goes to replenish money spent on development and then whatever's left goes to bigwigs and funding the next game.