I'm not entirely sure that is true from the stand point of it being deeded property, only. There are condo and home owner associations that have out right banned Renting of the units. I have seen this both in Florida, Illinois, California, and Pennsylvania where the HOA have their declarations of the association banning rentals to some degrees or in total. I've even seen HOA's amend their declarations to ban/limit renting (not just at the creation of the HOA), though a condo/home HOA has more difficult rules in the declarations to amend much more difficult that what
DVC has to do to amend, per our POS.
Perhaps timeshares in Florida are special and unlike Condos/Homes are afforded a protection from rental restrictions; though my quick skim through of Chapter 721 did find a reference to limitations being allowed. With that being said, what stops DVC from saying if you were to rent, you could only rent out your Home Resort and have no rights to rent at other resorts. Because the Resort Agreement, where your right to the DVC Reservation Component is defined, isn't protected under fiduciary protections (modified by BVTC with no input from DVCMC or club members).
As for the Membership Agreements at the Resorts already have a section, 7.2, that states DVCMC could amend the Membership Agreement that would adversely effect your ability to rent:
"...These changes may affect an Owner's right to use, exchange and rent the Owner's Ownership Interest and impose obligations upon the use and enjoyment of the Ownership Interest and the appurtenant Club membership...."
And it doesn't explicitly guarantee any amendments be in the best interest of Members, only saying they are bound to do so as law requires (which Federal law is weak/non-existent on this point not sure what Florida's status is):
"...Further, although DVCM generally is required to make such changes in a manner which, in its reasonable business judgment, improves upon the quality and operation of the Vacation Ownership Plan and furthers the collective enjoyment of its benefits by the Club Members taken as a whole..."
I don't agree with this change but my experience with deeded property having bans (HOA's for condos and homes) and the fact that DVCMC can amend the Membership Agreement (with it already stating amendments could adversely effect your right to rent) lead me to believe it isn't a 0% probability. Do we actually know the Florida law that protects Timeshares?