LV
Nashville
Charlotte/Durham
Montreal
Portland
SLC
Mexico City (outside of the box, would be hard to get the union to approve)...if not, somewhere like Juarez or Nuevo Laredo that are on the border/s.
Vancouver's too close to Seattle, one would imagine.
Indianapolis.
Texas already has three teams, but the Austin/Round Rock area has massive growth now.
Columbus (maybe, but already CLE and Cincy struggling as smaller market teams)
Sacramento
Louisville