This is certainly not unique to the Zips and is sadly one of the consequences of the current rostering climate.
As a guy who went to schools in the Big East and Big Ten, when I moved back and resumed watching the Zips, it was refreshing to watch guys develop over several seasons. There have been guys like Jeremiah Wood who might have gotten plucked up by a bigger program .. and we would have missed seeing him mature, rally from injury and become one of the elite Zips players of all time. A bigger loss, in my mind is guys like Jimmy Conyers and Jawanza Moore who were afforded the time to get better, have the game slow down .. and then have really impactful senior years.
That's one of the reasons I wouldn't have traded my JAR seats for front row at Mackey or Gampel .. my kids could follow the program, see the same players .. get to know them a bit, and really follow the program.
It will be interesting to watch as it develops. The pendulum will eventually swing a bit back in favor of the smaller programs when guys start getting left in the portal to land in D2 / D3 ... or nowhere. With the top programs eating each other up for a one year deep tournament run, teams like SDSU and FAU will become more common and succeed with continuity and togetherness and make a dent in the Sweet 16 and beyond. It takes the right people and a commitment to the mindset .. but it can be done. Stability isn't something many of the top programs value at the moment, unless they're hanging banners.