I can't comment on the status of the specs in the Lord core, but on retail, Beast Mastery was a very good spec well into ToC for raiding. I believe it was even the best Hunter spec in Ulduar for some time. Marksmanship only reigns at the end of ToGC and ICC because of how well it scales with ARP (because by this point, you are approaching the cap, passively, before procs or gems). Survival should be making an appearance into ICC, regardless of its DPS, due to how the spec can interact with some encounters (Deathbringer Saurfang come to mind). Beast Mastery doesn't hold up in ICC because it just doesn't bring the DPS the other specs can, and it can't really bring any utility the other specs can't.