Social problems can be addressed with incentives. It's not easy, but possible.
They probably need to increase tank DPS considerably, preferably where you can make a significant survivability tradeoff. Instead of hitting x you hit y when you want to do huge damage. For example, if prot pal had something like Templar's Verdict as prot where you could do twice the damage but not get the active mit that would be great. Also, all tanks need a dps cooldown at a minimum.
I think a lot of people don't realize how easy tanking is 99% of the time, but it's boring as hell because you do so little dps that it barely matters how you use your buttons. I had fun for a while this patch trying to do max DPs as a paladin (which is very high, can often beat mediocre dps players) but that's not true for most specs. And never true for single-target.