I've met redstormnc in Charlotte a few years ago at our last ncaa appearance. I had 2 of my kids with me. I believe he had his young son. He's a great fan and dad.
First off, fan base is a reflection of success. One that has a heavy dose of students and good age distribution 20s thru 60s reflect a long standing successful program. Our fan base is largely a "I remember when base" When you don't win during a,students 4 years, you've basically lost him. I doubt my son will ever be a fan of his school's teams because it's been a bad years. His student experience doesn't include athletics. My daughter's experience is different , with all tourney years. They still follow their schools. All are (blindly) loyal to st johns bball.
I'm not sure that ball movement and structured offense is a shortage of coaching. Guys like Lovett and Ponds are likely better than Davidson could recruit but are also freelancers. A highly successful program like Duke recruits not only the highest talent but those who will fit into a system. Each kid is pick of the litter.
St johns has been in continual build mode at least since artest. We generally jist recruit the best kids who will come here who possess Big East talent without regard to fit. For mullin so far, it has been rough to just fill a rotation. Lavin inherited an unbalanced roster of all seniors. Roberts Inherited nothing. Jarvis inherited some deft fraschilla recruiting. We haven't had the luxury in a very long time on passing on a big talent because of fit. We have a lot if seats to sell in a market filled with pro sports teams and hundreds of entertainment options. Davidson and st Bonaventure for the most part are the big deal in town.
To build (not rebuild) a younger fan base will require sustained success of ten to twelve years. If we get there, it will happen. It would be really interesting to compare median age of our season ticket holders to theirs. I would guess ours may be well into the 60s. Our loyal base was created in the lapchick-carnesecca years of perennial post season.
Sad truths. Only winning fixes everything you mention - sustained multi year winning - a PROGRAM. whether it ever happens remains to be seen