In my opinion, templates are a failure for gutting the usefulness of some stat-specific specs. Honestly, I think they could balance out PvP by using your current stat weightings as how they distribute the fixed amount of stats.
For Example; Your fixed secondary stat total is 16000 points
On your gear, your stats are divided as 40% mastery, 40% crit, 20% vers (out of 100%, not actual value)
When in PvP, blizz will then give you 6400 Mastery, 6400 Crit and 3200 Vers
This also makes your gear choice actually mean something and if you want to stack 1 stat over another to overcome some issue you're having, you have the ability to do it. You also aren't forced to have 1/4 of your stats put into something that provides little to no bonus for your spec (ie: Haste for assassination rogues; provides nothing but a little extra energy/sec, has 0 synergy with Bleeds/Poisons which almost all our damage comes from)
But that's just my opinion.