That's not what I said. I don't know if the new players will be or won't be as good, but maybe they are a better fit for what the coaches want to do. The bodies most definitely need to be replaced. Can't field a team otherwise, but the remaining incumbents can help fill the gaps in productivity. I prefer to look at it as the Moneyball approach. I don't know if you read the book or watched the movie, but a basic tenet in both (disregarding the A's outstanding starting pitching at the time, which was glossed over in the movie) was not how to replace individual players, but how to replace their production. For example, Jason Giambi hit 38 of Oakland's 199 homeruns in 2001. Oakland as a team hit 205 in 2002. Johnny Damon had 165 of 1,469 hits in 2001. Oakland had only 19 fewer hits as a team in 2002, while winning one more game (103 in 2002 vs. 102 the previous year).
Bringing it back to UConn, there are other variables besides intangibles, but yes. Experience and comfort in their assignment does play a roll. Also most of the players who played their final game vs Cincinnati spent 3 or 4 years in different schemes, utilizing different techniques that presumably had to be either unlearned or used differently.
Regarding your last sentence: If that were true, you'd still see 38,000+ people in the stands. Personally, I am certainly more salty than I was 7 years ago, but the gameday experience does not only include time spent inside the confines of Rentschler Field. It also is an opportunity to spend 6 or 7 days in the fall with a bunch of friends who aren't able to get together nearly enough anymore.