I haven't read any post by anyone objecting to this addition to the POS. In reality, it's not a change at all -- it's just a codification in the POS of the amplification/clarification DVC legal did about a year ago.
At that time, they apparently did some basic auditing work, identified some owners with more than 20 ressies over a year period, and sent them letters telling them DVC was looking at their accounts to see if they were being used for commercial renting. In that letter, DVC legal reminded the owners that, if commercial renting was identified, DVC had the option of cancelling those reservations. (A much more likely scenario, IMHO, has always been DVC would simply decline to make ressies they felt were commercial...and the more detailed information in the POS amendment seems to bear that out.)
I personally think many of the true commercial renters are in the process of getting out of the business. Right after the DVC legal letters, there was a sudden uptick in the number of resales available. More importantly, I noticed a change in the character of many resale contracts. Where before we had seen a lot of "loaded" contracts with full current year points and banked points, we suddenly started seeing many more stripped contracts.
If you look at resale listings today, you'll still see many, many contracts with virtually no current points. I suspect many of those belong to commercial renters who have rented out all the points they can without taking on extra risk by borrowing, and are now selling the contracts. Many of those contracts undoubtedly had to be held through the holidays because they had pending rental reservations on the contracts.
If all that's true, this strategy will be very helpful to the average owner who wants nothing more from their accounts than great vacations -- and it won't hurt those who rent occasionally.