[chipperyman573]

It's impossible to tell for sure - if you could, there wouldn't be any failed startups... People would leave the moment they knew it was going to fail. You know more about your company than anyone else, and you seem to think it's going to fail.

In my opinion, you should do what makes you happy, even if that means working at a failing startup. That said, you should definitely keep your eye out for other jobs, but don't act on any job offers until you find one you think you would enjoy as much or more than your current job and pays the same or more. You don't want to be stuck out in the cold if your startup fails, but you have plenty of time to look around. Don't rush into anything.