Let's help the DPS queues

[Arrius]

Want people to heal and tank? Don't make healers and tanks boring or clunky.

Again - Healing and tanking requires a special mindset, the willingness to give yourself for the team instead of doing constant big numbers, being on the mercy of the DPS, and the readiness face criticism when you don't perform well.
You can throw in new Tank and Healer classes left and right if you will, in the end roulettes will still give out the 'Adventurer in need' bonus to either of them 95% of the time once the 'new' shine has worn off.

Those roles aren't for everyone, while DPS can be played by anyone without bigger punishment other than longer dungeon clears.
There's a reason why healers/tanks/supports in nearly every mmo, moba and competetive pvp game are the least played class/role.