As long as people keep giving him money, this will keep going.
If he is not in a stable mental condition to continue working on the game as he claims, that's one thing. But he should pull fundings as he clearly has no intention of finishing a product people paid money for. He could also look for a successor to keep working on the game. Or at least finally put that fucking abandoned tag on it and be done with it.
This is as all of the signs of a man who doesn't care about his community anymore and the very project that made him successful. I pulled out my pledges a long time ago, I encourage everyone else to do the same.