I don't think failure to deliver is the biggest issue; the real problem is that he seems to have gone completely dark on his backers while apparently continuing

I don't think failure to deliver is the biggest issue; the real problem is that he seems to have gone completely dark on his backers while apparently continuing to cheerfully update his Facebook status. I'd guess that he's somewhat overwhelmed by the situation and unable to deal with it, so he's pretending it doesn't exist. If this is the case, I hope, for his sake, he manages to face it long enough to get it out of his system. I know from experience this sort of thing can eat away at you, and that letting people know you messed up can be a huge relief.