EA doesn't have to do any more than convert the tablet version of The Sims Free Play into a PC version. Playdom did it with Disney City Girl; for awhile they converted some of their facebook games into PC versions with the same type of gameplay. I actually think that, if EA put its creative thinking caps on, they could easily adapt the Sims Free Play into a PC version; there's a lot more to do in that game than there is in a Sims Online clone. Sims Free Play has life stages, for example.
However, it may not be what players expect in terms of being able to chat live with other players. In Disney City Girl's PC version, I couldn't chat live with other players. My avatar could only visit their avatar and chat them up to get social points.