You mean until the show ends?
The show will end when the producers can no longer figure out how to make much money from making new episodes.
A major way of measuring whether they are making good money is from American cable ratings. But there are other sources of income, including ticket sales to various types of events; and this show seems to translate to other cultures and languages very well, and looks like a very successful export, at least given the size of its American audience.
(Comedy doesn't seem to translate and export as well as things like soap operas, or the type of drama of this show; and you don't need to have an intricate understanding of a different culture to understand the dancing.)