MLS case for St. Louis and Sacramento.... and 30 total teams

A thorough case for the S-teams:
forbes.com/sites/prishe/2019/01/23/will-sacramento-or-st-louis-become-major-league-soccers-next-franchise

Futures not pictured: Miami, Nashville and Austin.  wikipedia.org

That looks to be 28 squads with teams like Austin and Miami lying in wait.
 After those squads, who else?  Two more and a tenth year breather?

                Arizona and Carolina ?
Something wilder like West Texas Divided or tag-teams like North Country or West Coast United? What Travel-team like squad could comprise East Coast or Bootleggers (Appalachia) United ?
San Diego and Tampa?
OKC and Alberta?