It's also important to note that once people are using your product, it's a different sort of motivation you'll see. People count on you, they'll have feedback,

It's also important to note that once people are using your product, it's a different sort of motivation you'll see. People count on you, they'll have feedback, nitpicks, whatever. You will see what needs to be changed and what can work and what can't. Absolutely launch. Mark it as beta/experimental if you don't think you can afford to adapt it as needed, but you have to put it out the door and see what happens. I think the original poster is going to find that the questions he's asking will be answered once he launches. Having a product in the field is the best way to see what's viable and what's not. You'll get a "yay"/"nay" answer once that happens and the world will look different than it does today. The cofounder might also step up a bit when he sees there's something out there in people's faces and his name (eventually) is on it.