I know I'm biased here, but I don't believe that Minnesota, California, and Michigan State are all worth more than ND in CR.
Don't get mad at me because I'm trying to give you an honest answer of why ND has less value than you think in CR. meaning once they join a conference. The argument would be if they don't have their own network, than it would massively decrease their value. The alumni base is small compared to most state schools. People watch Notre dame because they are on TV in prime time against good opponents and the games are VERY VERY hyped by the network. If there's no personal TV network deal and less national games, than that hurts recruiting and massively hurts fan support. On field success goes down. ND is worth a lot because of their independence and TV network/ media attention. If they join a conference they are clearly going to be a big part of it, but will not be the lone shining star that gets all of the attention they do today. As it stands now Notre Dame is top 3 in value, but once the school joins a conference that will decrease to 10-20 range just like other schools with a lot of football tradition. All things being equal I don't think ND is ahead of schools like Michigan, Ohio state, Penn State, Florida State, Texas, Oklahoma, USC, Florida, Alabama, LSU, Georgia in terms of value from fan support and overall ability to be competitive year in and year out everything being equal from an exposure stand point. Sure Notre Dame can sell academics and tradition, but a lot of schools have tradition and there are other schools like standford, UCLA, USC and michigan that have similar academics but can offer different college experiences to recruits.
So in conclusion, the eye balls are there because of TV exposure and hype for their games. Recruiting is there because of the coaches being able to sell a ton of national exposure in addition to tradition. Once the exposure and hype is reduced it puts that aspect on a level playing field with all the other colleges. Now on field success and the ability to lure recruits to go to their school over other programs will dictate value to a conference.
As you can see, it will be tough for ND to be a top 10-15 program unless the media keeps hyping them (which could happen), but they will still compete with the 2nd tier of programs in the long term such as Minnesota, Cal, and mich state you mentioned.