Don't think it will ever happen. The Sunbreaker Titans got nerfed because they were a bit overpowered and everyone was using them. Bungie doesn't want one class and/or sub-class to be the "fav". So they tweaked so folks would stray back to a more normal distribution. With regards to the electro-warlocks, there just are not enough people maining them to make a diff. The vast majority of folks playing crucible are Titans and Hunters - I know because I play as a warlock - the black sheep of PvP.