I think the whole point of what they did is to get people to STOP farming CM and Prae. They are story dungeons and should stay that way. I personally prefer 4 man content as a Tank. I like being the only tank in the dungeon

As for 8-man content. I think the tombs on CM and Prae should stay where they are. If anything they should release a new dungeon that is 8-man (maybe ilevel 65 gear) that drops both philo and myth tombs.