I definitely admire that you and your team are setting a deadline then just jumping in. I can't comment on whether or not this will work for you or not, but I admire the guts it takes to do this. One thing others in your situation need to consider, however, is that if you're brainstorming with your team daily and haven't found an idea that really strikes a cord with all of your, there's no guarantee that you'll know when this will happen after you've all left your jobs. When you no longer have a paycheque, you might feel forced to pick something that doesn't seem like quite the right fit because you have to get something done and start making money to pay the rent. It's imposing somewhat of a deadline on yourselves that you might not have if you all agreed on the idea before you left your jobs.