I would tend to disagree with this, based on what I have seen around San Antonio and Houston. Most notably, Judson is a pretty strong high school team and they, and the other San Antonio high school fields all have tracks, as does the stadium in Odessa where Permian plays.
College wise, most of the smaller schools also have tracks like Incarnate Word, SFA, Lamar and Sam Houston State. SHSU is currently working on renovations to their press boxes, and I don't think they are adding seating or taking out the track.
Very disappointed that Montana is playing at UIW in 2028. I have only been to a couple of games at Benson Stadium, but the last time I was there the visiting team was still taping players on training tables outside near the baseball field that is directly adjacent to the "stadium" and their basketball facility. Seating for basketball is probably about what I remember at Hellgate back in the 80's.