1-The game doesnt need to "break" the holy trinity, it needs to RE-invented it.
2-Problem with the support class, is that it existed before, on classic you can see it, those classes that dont add too much damage or too much healing, but have diferent types of support skills, like blessing, debuffing, ccing, etc. And right now, how people's mind seem to work on retail, everything its damage, you need your cuota of damage. You need to fill the requirements of healing or hp x sec. Thats why "support" style of gameplays are not "favored" by the community.
Its comes down from the playerbase to accept this new type of "gameplay" that it doesnt involve "full dps, full hxs, full vit, def, dodge etc)
3- the positive one, is that many classes can have a support spec as the 4th spec, from Rogue havinh exposed armor again, to warlocks being the full cc gameplay, to just Auras from a bard or a warrior spec. Who knows.