If Elena becomes a vampire the salvatore boys might not be interested in her any más because once tu become a vampire all your emosions are heitend they will probably wait a couple of years until a new doppelganger from elena and fall in amor with

There's not going to be a new doppelganger. Elena didn't have a baby before turning into a Vampire. I didn't get your pregunta though.

As NiazAbedini & clairmxxx already siad, there' won't be another doppelganger, Elena ended her line (if we won't suddenly learn that she has a missing sister o close cousin.). tu should explain what tu mean with your question, becasue this pregunta really isn't clear... Why wouldn't Salvatore brothers be interested in Elena when she'll be even más in amor with both of them...?