With shit like that I don't think the concept of "full BIS list" still exists, especially with gargantuan T15 loot tables (30% of this shit will never drop during whole patch, in any given 10-man), then there's the TF crap, screwing over 10man even more. It was pretty possible to reach full BIS in 10-month long Dragon Soul, but now the tiers won't last more than 6 mo. and only people getting "BIS" are propably those that are doing cutting edge progression, gear funneling via alts, farming heroic content since week one. But even then RNG can screw up, Raxxed is pretty damn cutting edge and number god still says fuck you.