Requires teaching good hygiene.
Retention of the foreskin requires teaching young boys at a relatively early age the importance of proper cleaning habits.
Seeing how badly American parents do teaching their kids anything about sex, my guess is this trend would lead to an additional mandate that schools teach proper foreskin hygiene in the 1st grade.
Which in turn will lead to outrage from the very parents who are opposed to circumcision and fail to teach their kids about sex.