Seeing what yall did when you announced ESO after Skyrim, I'm kinda expecting the same for Fallout 4.
For god's sake, please don't do it.
Most of us are happy with a Co-op version of Fallout 4, maybe release it as a separate DLC if you want. We however don't want an mmo.
We don't want everyone and their mother run around the damn place. Sole-Survivor means exactly that. SOLE-Survivor.
You've near wrecked the Elder Scrolls series with ESO. Please don't wreck Fallout.