Perhaps its because many people who sold Section 529 plans knew that mentioning that possibility would hurt sales. Or perhaps its that they didnt know or didnt seriously believe it could happen.
Thankfully, the Pension Protection Act of 2006 made tax-free qualified withdrawals from Section 529 plans permanent. This legislation counteracts the sunset provision for Section 529 plans that was included when they were initially created under the Economic Growth and Tax Relief Reconciliation Act of 2001 (EGTRRA).
Non-qualified withdrawals (those not used to pay for college related expenses) will continue to be subject to a Federal and state income tax on the gains, as well as a 10% penalty on any gains.
It still remains to be seen if Congress will attempt to close some of the estate planning loop-holes created along with Section 529 plans.

