Two of the three that started men's lax programs

Since 1982 did not have a significant Title IX obstacle to overcome. That could be a significant obstacle moving forward, particularly since the majority of Power 5 football programs are at public schools, and at many public schools, female students are in the majority.

The only other FBS level school (not Power 5) to be added to the list of schools sponsoring both FBS-level football and Division I men's lacrosse in the relevant time period is UMass. UMass is a little different, however -- in their case, the men's lacrosse program existed first, and football wasn't elevated to FBS status until much later.

As an aside, I've been trying to come up with a list of schools which formerly sponsored Division I men's lacrosse but discontinued the sport, at least at that level. In addition to the Power 5 schools you listed, I've come up with (all non-Power 5 schools) Butler, Morgan State and Presbyterian. Any others that you know of?