All Disney has to do to stop walking is to limit the number of changes to a single reservation to say like 5. They could do that tomorrow and for the most part eliminate walking.
DVC has two ways it could greatly reduce or end walking by professional renters, as we know it, that would not require adopting any new rules that limit the number of reservations one can make, or when they could be made, or limit the number of times and ways a reservation could be modified.
A.
Adopt Old Rule
Before June 2008, the reservation rule was that you could book a room 11/7 months out from date of departure from your room, e.g., today Feb 4, 2024, you could book a reservation at your home resort for a Jan 1 arrival and Jan 4 departure.
Some did a form of day-to-day walking back then but its chances of success today for any multi-day reservation for hard to get rooms at hard to get times is highly questionable. Example, someone who wanted a Jan 3 start date and Jan 8 departure, would, today, reserve the night of Jan 3 and have a departure date of Jan 4. If lucky enough to get that, tomorrow, Feb 5, the member would reserve the night of Jan 4 with a Jan 5 departure date, but in trying to get that Jan 4 night, the member would be competing with everyone else trying for a Jan 5 departure night, and thus would have to get lucky every day to get all the nights desired using that method. It would thus be a system that would greatly discourage professional renters from trying to get hard to get rooms for hard to get times of the year.
Of course, everyone using the normal 11-months out from date of departure rule for any multi-day reservation would also have a high risk of not getting a hard to get room at a hard to get time of year, and thus the only problem being reduced is one of professional renters walking.
B.
Require Copy of Rental Agreement
DVC could likely eliminate or greatly reduce professional renters from walking under the current system in a way that would not impact other members having the ability to do some rentals because of the need to give up an existing reservation or to gain some income to offset some dues. The POS's require, in the Condominium Rules and Regulations, that all rental agreements be in writing and contain terms informing the lessee that the lessee has to follow the Condominium Rules and Regulations relating to occupancy and use of the room and resort. DVC could create a rule requiring, for any rental, that a copy of the written agreement be provided to DVC so it can confirm the contract has the necessary terms, and if a member does not provide the written contract, and DVC discovers that failure, it could cancel the reservation.
A professional renter would want to avoid that rule because following it would give DVC the information it needs to find a violation of the commercial purpose clause due to repeated rentals by the professional renter. But if the professional renter is actually going to try to withhold the contract from DVC, he would be legally required to tell the lessee of the obligation to submit a copy of the agreement to DVC and that his withholding a copy from DVC would create a risk that DVC could cancel the reservation if it learned of the reservation. If he failed to inform the lessee of the issue, and DVC learned it was a rental and cancelled the reservation, the lessee could potentially sue the professional renter for fraud and possibly get punitive damages. Moreover, if the professional renter actually tells the lessee about the rule and that he is not going to follow it, I doubt the professional renter would find a lot of lessees who would be willing to do the reservation by agreeing to withhold required information from DVC.