Rotational players (of which there seems to be many) cannot even bear Story Progression in a Sim game. Imagine giving control of their world and their Sims to other players.
Don't even get me started on the amount of trolls that will start to come out of the woodwork, for the sole purpose of ruining someone else's game play.
If this is the direction that EA is going with the Sims series, I suggest that they think long and hard about it before they commit. They've already destroyed one of their iconic series over this.
There is still a strong market for single-player games. The Sims series is a huge example of one. Story-driven games are the other. If EA is insistent on putting all of their eggs in one basket, I hope that there are other companies that step in to fill the vacuum and clean their clocks -- pretty much like what happened with Sim City/Cities:Skylines. All games are not meant to fit the same mold.