The tampering would still occur.My thoughts are the portal rule regarding HC changes is a real disservice to the players/student athletes. Couple things (1) it seems like a tremendous win for everyone in the game that is operating far on the fringes and/or unethically (2) we should remember that many of these guys aren't really equipped to make life-changing decisions at the drop of a hat and, at that point, they don't even know what their options are.
My suggestion would be that the portal open for 2/3/4 weeks but not until 2/3/4 weeks after the coach leaves. Old coach leaves, new coach comes in, everyone has time to evaluate and make thoughtful decisions. Just my two cents.