Moshe Rabbeinu told Klal Yisroel that when there will be a Beis Hamikdash, it won’t be anymore the idea of Ish Kol Hayashar Be’einav Yaaseh’, and that we will be one people and come to one place. Following this logic, it seems to follow that when Moshiach comes, the same thing will apply. Just like he will physically gather the scattered Yidden, so too will he bring us together to become more of a single people.
It only makes sense that our Havaros that were so affected by the countries we spent Galus in, will be dropped — perhaps not in one generation. Levush, too, will most probably become universal.
Moshiach is not just another, more succesful leader. Moshiach is Ram Venisa Ugevo’a Me’od. It is a new type of era, where Ruchnius will reign.