The right attitude is to not throw shit to the wall and see if it sticks, but to think of an idea and commit to it. With commitment comes the responsibility of doing right by your users, finishing your idea out and not giving up two weeks later. If you aren't prepared for it, if you aren't committed, if you are already nearly burned out from the work you've already put in and have no traction to speak of, well then maybe just leave it alone.