Kickstarter makes it too easy to fail without consequence. Even big names like Neil Stephenson did so (with his swordfighting game, turned out the money ran out and the game wasn't much fun so they just gave up). I don't doubt his sincerity but this model is not ready for the masses. The masses want to buy products, not promises.
Patreon on the other hand, makes it too easy to stay forever in alpha, the money will keep coming in while there's interest and eventually it wanes and the author moves on to something else. But the product never actually gets finished. In the mean time over the many months more money will get spent on it by each 'customer' than on an actual finished product.
Another big name that's currently in this situation is Star Citizen (which was a bit of combo of both models, with continual crowdfunding). Who knows when that'll ever be finished. They certainly have more than enough money but what's lacking is the role of the publisher in the traditional model, who keeps the project on track because they want to see RoI eventually.
The crowdfunding models are great sometimes but they're seriously lacking on this point.