They're up to about 1/5 the revenue of the NHL and soccer is more popular than baseball or hockey among generation Z. They're up to 30 teams counting the 3 announced expansion franchises. All of their markets have at least 1 other major team except Austin. They have LA, NY, Chicago, Philly, Dallas, DC, Toronto, Vancouver, Montreal, Bay area, Denver, Houston, Minneapolis, Miami, Atlanta, Seattle, Boston, etc.
I hate soccer but it ain't going away. A big part of it is the growing latino population in the US. They're also partially responsible for the resurrection of boxing.