So did I :). But, as regards how long Avenged Sevenfold will last, I'm guessing they will be forgotten before long. People are already beginning to get sick of metalcore, and before long, most of the bands from that scene will be in the toilet, IMO. I think that the ones that survive will be the popular old guard (Killswitch Engage, God Forbid etc) and the newer ones who take a more idosyncratic approach - and unfortunately for Avenged Sevenfold, their niche in the market is more competently filled by bigger bands.

Just my deranged thoughts on the topic.