Maintaining dominance for consecutive seasons in men's college basketball is not easy. Leaders graduate, stars declare for the NBA draft, more than 1,000 players are already in the transfer portal and coaches leave for greener pastures. Sometimes, we barely recognize anything other than a team's jersey by the time November rolls around.

As a result, many of the top teams from one season end up missing the dance altogether the following March.

More than half of the schools (38 of 68) that participated in the 2021 NCAA tournament were not invited to this year's dance. We aren't just talking about the minor-conference revolving door of automatic bids, either. All of the No. 1 and No. 2 seeds from last year made it this year, but nine of the 28 teams seeded No. 7 or better did not.

Looking at that same pool of 28 candidates from this year's field, it's not hard to pinpoint teams unlikely to participate in the 2023 NCAA tournament.

Needless to say, there are plenty of unknowns still in play. There are still a few big-name recruits available, most notably 5-star forward Julian Phillips, who decommitted from LSU a few weeks ago. Many NBA draft decisions are yet to be made. Of the nearly 1,100 players who have entered the portal, about 1,000 are still there for the taking, and it's likely just a matter of time before a few hundred more players join that list of "free agents."

But we can still make some way-too-early educated guesses at which teams are most likely to experience a bit of rebuilding.

Teams are listed in alphabetical order.

Also considered: Connecticut, Michigan State, Ohio State, Saint Mary's

Iowa Hawkeyes

2022 NCAA Tournament Seed: No. 5

Players Graduating: Jordan Bohannon

Players Likely Leaving Early/Transferring: Keegan Murray, Joe Toussaint, Austin Ash

Noteworthy Arrivals: None

I would be remiss if I didn't start Iowa's section by pointing out that I also expected the Hawkeyes to falter in 2021-22. It hasn't even been five months since my preseason bracket projection in which I called Iowa the "obvious choice" to be the team that goes from a No. 1 or No. 2 seed one March to missing the dance the following March.

But who the heck saw Keegan Murray coming?

Iowa was supposed to struggle after losing a two-time first-team All-American (Luka Garza) in addition to several other key members of last year's team (Joe Wieskamp, Jack Nunge and CJ Fredrick). Instead, Murray blossomed into a first-team All-American, and the Hawkeyes merely slipped from No. 7 to No. 13 in the KenPom rankings.

With Murray now off to the NBA, they can't possibly do it again, right?

Keegan's brother, Kris, did have a couple of mighty impressive performances this season—most notably collecting 29 points and 11 rebounds in a January victory over Indiana—so it's at least possible he becomes a star for the Hawkeyes in 2022-23.

While this team looks to be in good shape down low between "the other Murray," Patrick McCaffery and Filip Rebraca, the big question here is guard play.

Bohannon's college career is finally over after a staggering 179 games, and they've also lost Toussaint to the transfer portal. The former was a veteran leader with more than 2,000 points and 700 assists in his career. The latter led the team in assists this year and was (along with Keegan Murray) one of the only positive aspects of Iowa's defense. Replacing both while also hoping Kris Murray can make a Keegan-esque leap is asking a lot.

Let's not forget that Iowa was a bubble team in mid-February. The No. 5 seed makes it seem like the Hawkeyes would need to have a significant fall from grace to miss next year's tournament, but they had to go 9-1 down the stretch with several quality wins away from home to get there. It wouldn't actually take much for them to slip out of next year's field.