Remember kids: simcraft is everything in the first tier predictions of WoD.
Last time this happened, everyone was abandoning their rogues for monks or druids to fulfill that leather melee. I got my rogue to 90 in the first three days of MoP without any DPS issues. Fuck, I was top in most heroics until I could do some actual shit like the world bosses (I didn't raid until later on when it came to progression).
Just play what you want to play and just get good at it? Don't rely on simcrafting.
They said healers got the short end of the stick. They were right, but that's only because of the new system. There was a lot of speculation that due to the DPS decrease, Disc would be shit.
I guarantee you, it's not. And that was before I found out I had Holy Nova. If anything, every other healing spec BUT Disc got shit on.. because.. uhmm Holy Nova.
Just give Blizzard time. They'll give you something that will reignite your desire to keep playing your favorite class and spec.