Land just isn't as important as it used to be. So I doubt you'd see a strong movement to bring back fee tail. On the other hand, IIRC from law school, several states have arleady abolished the rule against perpetutities and allow for perpetual trusts, so long as the trustees have the freedom to invest the trust res as they see fit. In other words, the trust can't be required to hold on to a specific piece of real property, but it can keep principal out of the hands of heirs and only distribute income essentially forever.