No, not at all, just that content from level 50 doesn't offer any benefits to a level 60 player and their time is better spent completing the current raid content in order to receive items and equipment relative to the endgame item level. The game according to the most recent unofficial census actually saw a larger number of players than expected. Incentives exist for the level 50 hard dungeons in the form of roulette bonuses, for instance, but there are none for the older raids. As I said, they'll be adding exclusive items back into them so the content should see more activity in the near future.