"The number one thing not to do is other things. If you find yourself saying a sentence that ends with "but we're going to keep working on the startup," you are in big trouble. Bob's going to grad school, but we're going to keep working on the startup. We're moving back to Minnesota, but we're going to keep working on the startup. We're taking on some consulting projects, but we're going to keep working on the startup. You may as well just translate these to "we're giving up on the startup, but we're not willing to admit that to ourselves," because that's what it means most of the time."
I've run into similar situations before. This is a serious problem and one you should deal with immediately, because it will only get worse. Have an honest, tough talk with your team. It sounds like you won't convince them to put it all on the line like you have, but at least you'll know and you can make an arrangement so that you're moving forward with the company and not having this looming over your head. If worse comes to worst, tell them you are going to move on because its sounds like you are pretty talented and there are many opportunities for someone like you.
Good luck.