Nothing wrong with posting the rumor but I think you're discrediting your own information via the editorial comments. So far you've implied that an outside service would cost more, that service would be less frequent, that drivers would be less courteous than Disney CMs, and you've also pointed out a few things you believe to be logistical issues.
Sorry but I just don't buy that
DVC (a Disney entity) would go outside the family to provide poorer service at a greater price. I also don't see how this would even work at most of the resorts which SHARE SERVICE between cash and DVC guests. There is
no chance they will put separate DVC / cash busses at the Beach Club or BoardWalk or Animal Kingdom Lodge.
DVC charges members transportation costs and those costs originate with whatever WDW Transportation decides to charge members. If there is any truth to the rumor, I'd say that DVC might be obtaining competitive bids in order to determine if the costs being charged to members are reasonable. DVC has a fiduciary responsiblity to all members and part of that responsibility should include determining whether WDW Transportation's charges are in-line with the rest of the industry.