You won't get any customers until it's at least out of the door. Seriously, JFDI if you can and get it out. Worrying about flexibility if you're successful is a

You won't get any customers until it's at least out of the door. Seriously, JFDI if you can and get it out. Worrying about flexibility if you're successful is a luxury problem, and if you're not successful then you just saved a load of time.