It all depends on how long she will be around.
Is she committed to 3-5 full years on tour?
I said this on another thread -- now everything is new again, fresh, fun. But, will the grind of a full schedule get to her again?
Certainly if she plays a full schedule for a few years and stays healthy, she can,and probably will, win more Slams.
But, as great as she is, she's not, by any means, unbeatable. Simply from a tennis perspective (don't want to get into the whole incident thing), Serena can still beat her. I don't think Venus will be as much of a problem, but she can defintely beat her under the right conditions (such as at Wimbledon). And, Kim is prone to some streaky play, so there may be unexpected losses, as there is with everyone.
I say this only to deflect the tendency for TWers, once a person has won something and played great, to assume that she or he will win everything for the foreseeable future. Yet, it rarely ever happens like that.
But, the future looks great. So, If she is around, playing a full schedule for 3-5 years, I think she can win 3-5 more Slams.
It's great to have her back.