In theory, a school's enrollment -- ALL THINGS BEING EQUAL -- affects its competitiveness. In reality ...
Coaching, facilities (quality and availability), student demographics and TRADITION collectively (and in some cases individually) outweigh enrollment.
It's that way in ALL high school sports.
It's also worth noting that "cycles" affect outcomes. Because H.S. kids (stars) come AND go in four short years, programs will experience ups and downs. The better PROGRAMS do a better job smoothing out the bumps.