I think in the end Emma is either going to die leaving Dylan so heartbroken that he will leave his entire family behind and move away cutting off all contact with the Bates. OR! Dylan and Emma are going to realize it is all too much for them and will leave together forever causing Norman to be more messed up.
Norma is going to stay behind even after everyone tells her to leave. Romero is either going to die or give up on her and get on with his life.
In any case Norman and Norma will be all alone by themselves until time comes where he kills her and becomes his mother.