It doesn't need to challenge NFL or NBA for there to be a lot of success and money made all around. The potential room for growth for MLS is massive in comparis

It doesn't need to challenge NFL or NBA for there to be a lot of success and money made all around. The potential room for growth for MLS is massive in comparison with the other established big leagues that already have reached a saturation point have have less room to grow. This is why the NHL has spent the last few decades starting up hockey teams in the American South where there's few fans instead of say, Saskatoon, where there'd be a legion of fans. In Saskatoon it's a small market and you'd already be top dog with no growth. In Phoenix you may never reach the other leagues, but even if you can move viewership by a few percentage points, the size of the market ensures massive gains.