I've noticed a trend here that people tell others that they should play a "viable" spec instead of a spec they actually want to play.
If you want to play one of the "viable" spec/class, then go ahead, please do so.
But if someone doesn't want to, why should they do what you want them to do?
This is the first official chance of playing classic again, it's an accomplishment for the community. Shouldn't this be a time to finally let the community experience the game how they wish to play, or how they may have played the first time they had a go at it?
Ben Brode(Previously Hearthstone Game Director) responded to a video about why there are bad cards in Hearthstone where one of the statements were "It's fun to have underdog cards". I think something similar can be said about the bad or "unviable" specs in Classic WoW. It's fun to be a "unviable" spec and do well at it.
Note that I'm not saying that i support any balance change to make the "unviable" specs more viable, just don't see why every priest (or any other class) on the server should be identical to the next because any indiffrences are viewed as sub par.