I think MLB is also the league that could most feasibly expand beyond the 32 team number that most of the leagues seem to be gradually converging on. It's easier to handle a few more teams when you play 162 games per year than when you play 16(17)
I think Austin is either going to lose out on teams or get them way later than it otherwise would due to our growth coming later than most cities.
Say in 20 years when we're a metro of 4M. There will be NFL and NHL teams in cities _way_ smaller, but they'll be there because they landed there when Austin wasn't big enough to compete.
Edit/add: found this fun wiki chart
https://en.wikipedia.org/wiki/List_o...rts_franchises
We're by far the largest city on there with none of the big 4, and by far the largest with only 1 big 6. And that's just today, much less in 20 years.