Like someone said in the above Reddit discussion: low level Vaseline players (that are the real problem) don’t really use MP’s to begin with. They just sit and camp, often losing their team the game by going purely for kills, which half the time they fail to get too.
The Mercs being affected by this are Fletcher, Proxy, and most of all Sparks. She has allready been nerfed quite hard recently (justified or not), and if this happens she’ll be left with no offensive capability whatsoever.
For Fletcher and Proxy, it is less of a problem, but they will still completely lose their flexibility. If MP’s turn into a close range defensive tool, there really is no reason for them to swap from their shotguns, unless they run out of ammo, in which case a pistol would have done all the same.

