I have mixed views on this subject. I don't think Plano's decision to remain large is speficially related to athletics. As many are quick to point out, Plano East has never won a state championship (exclusing non-UIL bowling). They have not dominated in baseball/softball or basketball. To my recollection, they have never made it beyond the state quarterfinals in football. Obviously, Plano is a much older school, so they do have several state championship trophies. Plano West has already claimed several 5A championships in s****r, girls basketball, tennis, golf?
I have not seen the case where good players are squeezed off of the teams due to the limited varsity opportunities, but maybe it happens more than I know. My three sons had opportunities to play the sports they wanted to play. Yes, they all had to make choices when it came to multiple sports. Yes, they may have been able to play multiple sports at smaller schools. But, they got good educations, found success in athletics, were prepared for college, and had no desire to consider smaller schools.
The PISD administration determines the direction of the schools when it comes to the senior high schools. Plano's population is 260K+ at this point. It would be difficult to build several additional buildings to adapt the other model, including the costs associated with educators, etc. Also, PISD has been impacted by Robin Hood over the years.
People choose to live in Plano for a number of reasons, including the reputation of the schools. Athletics is just one ingredient. I think Plano will build a new high school (9-10) and adjust boundries to accomodate the 11-12 population. There are 2500 kids at Plano East (give or take).....so around 7000 juniors and seniors in Plano. To change models at this point may require 4-5 more seconday schools and the huge costs associated with operating each of them.
All this to say.......
Plano schools have met the needs of our family. That's the main thing, I think.