As a tank, I've always enjoyed speed pulling, mostly because it is the only way to make otherwise boring dungeon encounters challenging. I also think its fun to push fellow players to the limits of their job and player capabilities. Sometimes we make it, sometimes we don't, no big deal. If we don't, I just hold back on the pulls.

Honestly if people are tired of speed running, maybe something needs to be done to make enemy encounters more interesting. Gating off the dungeon does not really seems like an answer. I always thought that replacing the large amounts of trash mobs with fewer, more power mobs similar to mini-bosses could be an interesting way to mix things up.