Hmm given all the discussion about friendship being of utmost importance for cofounders (particularly in the case of YC), do people think this would work?
While friendship is nice, I don't think it's necessary. More important, IMO, is respect.
Besides respect, friendship gives you trust and commitment. Ideas of venture do change along the way. A friend is committed to you before the idea of a venture came along, hence, he will be flexible with the change in the idea, the company, the profits, etc. On the other hand, a co-founder (who was not your friend) joined you based on the idea (or the money), hence, he will be less flexible when things change (if no friendship develops along the way).