Well, according to the one article, 53% of the 529 accounts are with families 150k and under. It would be nice to have an accurate read on those stats.I think 529s should remain as they are. Also, I highly doubt that the proposed changes actually occur. And, if they don't, perhaps middle class people who should be using them will be slightly more inclined to learn about them and actually start using them in larger numbers.
Either way... Should they actually bring this forth and it passes, there is time to wrangle up some extra money before the effective date and try to get as close to the limit as possible. Would hurt in the short term.