I have no idea if we will be successful or not.. I know for certain though that we will keep trying until we are (which may be never). My co-founder is my cousin, so he isnt exactly going away :) He's keeps my fire lit and I do the same for him.
My biggest fear is not being able to move as fast as if we were in the YC program. I think YC is a gentle push to release as soon as possible, which is important. I suspect many of the early-stage teams who are rejected do not actually execute their idea and release. (Hence the apparent absence of successful "rejected" groups maybe?)