Because that is all everyone will use for specials in PvP after the totally unnecessary special ammo nerf.
Bungie is digging their own grave. D2 will be a well-deserved flop if they continue down this road.
Edit: Since a few people seem to think I am whining about this, know that I barely play Crucible and when I do, I use primaries and sidearms. I am simply stating the proven fact that when Bungie nerfs something, something else replaces the nerfed guns as the new meta, and then the community will start complaining about [i]that[/i].
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If anything the sidearms are the new meta because it took -blam!-ing 10 shots to kill me from the chest holy shit