1: Many people certainly become Lubavitchers. A Chabad shliach told me that he estimates that about one third of all shluchim are BTs. I actually know one guy who raised his kids totally Yeshivish and yet the son became Chabad and is now a shliach in a big city, and his kids are shluchim too.
But contrary to Rebbetzin’s comment, most Chabadniks are not shluchim–most live in Crown Heights, some other big city, or Israel.
Keep in mind that it’s not all or nothing. Many people may learn Chabad chassidus, learn the Rebbe’s sichos, and even attend Chabad shuls and farbrengens, and yet retain a non-Chabad appearance, and retain regular Ashenazi nusach and minhagim. It’s the same with Breslov.
People shouldn’t feel stuck in the derech they were born in. Every combination and direction of change happens today–chassidim who become Litvaks, Satmar who become dati leumi, people who combine Chabad-Breslov-Kook-Carlebach, Ashkenazim who follow a lot of Sephardic kabbalistic customs, you name it. Whatever your soul is attracted to, go for it, provided it’s kosher–and see what works in bring you closer to HKBH.