If the goal of this change is to stop large commercial renters, I am not sure this is going to work.
DVC allows LLC to buy points and setting up a LLC is dirt cheap, like as cheap as $40. Won't a commercial renter just setup a LLC, run it till caught, shut it down, then start up another one?
Havin watched the DVCFan video on this topic, Paul even talked about some rental companies that encouraged individual owners to do spec rentals. So even if the commercial renters are all gone, owners who just want to do 1 or 2 rentals are still going to do spec rentals if they want to maximize their rental income.
If the pain point for owners is seeing confirmed reservations available for rent while they can't book the same room, then what would stop that? Not being allowed to change leads on reservations? Limiting the number of changes so the reservations can't be walked forever till a renter is found?