maybe.... but young men are fickle and often driven by emotions instead of measured logic and rationale- which is a nice way to say that "sometimes to get potential out of them you've got to be tough", and 'tough' could easily drive a kid to entering his digits on this portal thing...
it's not even clear to me how a kid 'enters' his name... I'm assuming they file some sort of form and send it to the NCAA who manages the enterprise?
If I were a HC and one of my players did such a thing I'd be plenty pissed about wasting all the effort recruiting and developing them, and with their indecisiveness on display, I'd be likely to sit them out....... of all team functions..... at least until they made a decision.
If i were a player, I'd believe the portal a godsend- allowing me to explore other potential possibilities. I'd figure, for instance, if i were a sophomore QB and had a really good season at a mid-major, and noticed several P5 teams were losing QB's to, say, the draft, and those players matched my style of play and my numbers supported the comparison? I'd for sure enter this 'portal'...
^and 'that' is what is capable of 'altering the landscape'..... P5 coaches could leverage it to find more proven players with far less effort. it's potentially the equiv of a vacuum cleaner sucking ALL off the 'better than average' and 'top skill' players into the existing power structures- with potential of eliminating, perhaps, any competition found between 'emerging' programs and existing powers...