I think some could, but what a way to spend a day if you want to be anywhere close to the weight limit.Weigh in before match,weigh in after match see how much you sweat off, then drink weigh again,take a dump,weigh again,eat something weigh again,go to the table before next match weigh again.Then repete for next match.
What a hassle especially with young wrestlers.Of course you could enter at a weight heavy enough where that would not be a problem but I am sure some will do this making a much larger size difference than what we now have.That time should be spent concentrating on wrestling,enjoying family and friends.As it is now maybe a few blessed with fast recovery ability from unhealthy weight cutting have an advantage, but most times a wrestler pays for unhealthy tatics.A few pounds difference is usually more of an excuse for a loss than a reason.