Personally I think its the maps that are unbalanced. Even if you remove shotguns and FR from them you're still fighting at so close a range its not fun to use your long or even mid range primaries. They need to make their pvp maps like their pve maps and then the problem will fix itself. It was never a matter of unbalanced weapons only poorly designed maps.
While I would say there is some imbalance between the weapons themselves, like I said multiple times in my post, the bigger issue stems from high player mobility combined with cramped, CQC-style map design.
The problem with blaming the maps however, is that it does nothing to alleviate the current problems plaguing the crucible. The maps are a done deal and a known quantity. They've already been finalized and released into rotation. Bungie is not going to simply make new maps, then throw out all the old ones. I don't even think they can be bothered to redesign the current maps.
Therefore, efforts to better balance the crucible will likely need to focus on balancing the weapons themselves. My recommendation barely touches the weapon itself, but instead, makes it significantly more difficult to navigate the maps with a special weapon in hand, and will force players to use the weapons in their intended roles.
Thanks for reading. Cheers.