I think that Stefan and Elena will definatly get closer at the beginning of season 6 in their attempt to get Damon and Bonnie back from the Other Side, but I doubt that they'll get back together. And now that Markos is dead, who was apparently the one who was pulling Stefan and Elena together, I don't think that Stelena will happen.
There is no other side. As far as everyone knows Bonnie and Damon are gone forever. There are no plans to be cooked up. They will be in grief and acceptance mode.
The triangle should go with the otherside.