Ethan is a freelance contract workers right now, so this won't be all that functionally different for him. Three months was about how long he could run without problems on such a low amount; for the stretch goals and adding more time, the monthly amount will be higher.
It's not a lot of money, but in large part these guys (Ethan and his backups) really just want an excuse and opportunity - they are all working on the game already, and this just allows them to stop worrying about a lot of other things in the meanwhile.
It's just (in many ways) a particularly low-paying contract piece, and they will handle it the same way they've handled other contracts.
Besides, even if you did get 7,000 dollars how would we know this won't just turn into vaporware? You said that the main developer could disappear randomly, and that's pretty sketchy especially since your donators are entrusting you with 7,000 dollars to make a game.
Well... uh... the game definitely won't turn into vaporware. Since it's already, like, a thing. The features? Well, I'll be holding onto the money until it comes time to pay the programmer that is working on fulfilling the promises, so it's not like he'll be able to disappear randomly
with the money. And it's something you have to deal with for any project like this - bad things happen to people that you can't do anything about, and it's good to have a backup plan. It's something we hope doesn't happen, but it's something we are prepared for as well.
I'm wary of donating to this project because I do not see where the money is actually going, or why it is needed to produce a roguelike of this nature.
It will be going to food, rent, and utilities for one person, who will be working on the game 40+ hours a week and producing a log as he goes to keep people updated on what he's working on.