Basically, this only affects a few players on each roster each year.. a couple 18 year olds, some 19-20 year olds out of the CHL who may be low draft picks, or journeyman 3-4 year CHL players who are likely good top level players, but may be stuck in the echl/low AHL or top players in U sport.
Those would be players that go to NCAA at 19/20 after their draft year to get 3-4 more years of top level/still NHL visible.
Basically, USHL players will go WHL, USHL probably combines a few teams with WHL/OHL. BCHL goes back to Hockey Canada like it was (and should be).
So junior A is good again.
CHL gets better (some top American players/BCHL players)
NCAA gets way deeper. The mid to low teams, (non ND, BC, BU, Denver etc.) are now way more competitive, with good players coming off 3-4 years of 82 CHL games.
USport loses 2-4 top end players on each team.
an interesting observation, I've seen a number of more 16-17 year olds in junior A in western Canada, which traditionally didn't happen as MAAA is the strongest out of anywhere.
So not a huge deal, makes everyone better IMO.