Stevens won't leave and neither will Shaka.
I don't think Stevens is concerned with "Greatest of All Time College Coach" legacy- he loves the challenge and establishing of foundations. The NBA is the greatest basketball challenge in the world, and he's jsut starting to get people to "buy in" and enjoy themselves.
I follow VCU closely (they're screwed this year without Weber and with Treveon Graham hurt, by the way), and Shaka will not leave. I'll bet any amount of Tommy Points that he doesn't. He's another guy who has established a foundation. He's making great money ($1.2 million a year), and he legitimately has a "Family" culture at VCU. Pretty much every player on the team grew up without a father, and he's one of, if not the, most prominent male figures in the lives of all his players. Some of them even call him "dad." Shaka goes thorugh every offseason training program and "Ironman" drill with his team not as a gimmick but as a role model. That's why he never left for UCLA or such- he couldn't justify leaving the kids he helped so much. As much as Brad overachieved and had strong sentiments towards Butler, his actual emotional bond with his players is/was not on the same level as Shaka's with his players.