This game will be twice cheaper on the release. I doubt most big name publisher would be willing to lower the price from 90$ to 40$.
Only tools are buying overpriced games in alpha stage. You either pay such high sum to support development (donation) or you look at it as a cheap pre-order (if crowdfunding price is lower than regular price). Those who buy this game for 90$ are, like I said, tools.
What big publisher will do isn't relevant, because we (people who like indie games) are one world and they are the other. I don't even play hyped AAA games anymore. Had an option to buy Battlefield 3 for 5$, didn't want to because I didn't play previous such games I've bought (BFBC2 Multiplayer, Call of Duty MW2).