I assume that it is the job of the “Torah Nucleus” (term I learned today) to infiltrate the rest of the Jewish world.
Actually its been the way of Yeshivos for a long time to set up shop and let anyone that is interested come to them rather than send their students out.
Today there are different opinions on this. My Rosh yeshivah was of the opinion that it is more important to remain within the walls of the Beis Midrash rather than face teh dangers of the secular world.
His father-in-law Rav Wolbe felt that everyone should take something like one year out of their studies to do kiruv.
As WIY said, its not that simple to just pack up a family and their are other considerations that have to be weighed against the doing kiruv, such as the environment for your children that is conducive to Torah.
As it says in Pirkei Avos, “exile yourself to a place of Torah.”