So I went there it has nothing on the terms of their requirement to actually take the contract. All that outlines is that they will help you.
Slightly outdated from 2018:
https://www.redweek.com/resources/ask-redweek/will-marriott-buy-my-timeshare-back
Per them "The terms are simple:
IF the company wants to take back ownership of a specific deeded week, MVC will prepare the documents and close the transaction within 90 days."
So I am not seeing anything that doesn't point to a possibility of being stuck with a contract.
Now Disney is not required to buy back your contract but DVC will always hold some value unless the parks go outright under since your MFs are always going to be less than Cash. I can't say that for a variety of these other resorts where you can go next door and potentially get a similar quality product. With DVC your only non-Disney alternative with the same access is going to be Swan/Dolphin.
If its written in the contract somewhere they have to take it off your hands for no cost upon your request let me know as that changes the game.
Except it gives most people a rough idea of what you might be paying which is good enough for a top level view. I would not worry about all the details unless the initial math even looked remotely intriguing. Have to be honest the only difference I am really seeing based on that math is a lower upfront cost but the yearly costs will be lower and its at the location I am wanting.
The draw of DVC is going to be primarily location. If it were not for WDW I would likely visit central FL maybe 2 times a decade to get to Universal or Legoland or something.
Except everyone has historicals on Disney tanking and still being fairly valuable and rebounding. With other systems you hear issues of not being able to give away contracts. The contract being so low to start with in my opinion points to some potential issues. If the savings were that great and people were hankering for the locations so much then you would be driving a rental market larger enough to up the buy-in cost (which is what happens with DVC and it sounds like possibly very certain Marriot contracts).
Additionally location location location. I can see value in a location on property at WDW and I am doubtful that draw would ever go away for more than a very short term downturn. Flip side I can't say that is the case with these other timeshare locations where there is much more competition in the areas for visitors and no exclusivity built in to the area.
As an example if Marriot owned Breackenridge for all hotels and timeshares except for ones fairly far from the ski hills then I could see the value in owning that possibly (although for us it would not make sense).
Except its $3000 for 2 weeks worth of points. So there is really no value in the base contract just a liability it would seem if the math flips and all of a sudden Marriott decides to go back in time to not buy back contracts. Then it becomes a bidding war trying to get people to rent your contract or pay them to take your contract.
With DVC there is always going to be a base for renting out your contract unless WDW goes under. As right now I could rent out my points for around the same price as a Value or low end Moderate resort room would cost on cash with Disney. This would "get me by" for the short term until resale rates recovered.
Possibly you can do the same with Marriot as well depending on your contract but again WDW >>>>> Everything Else as far as the draw it has. Plus you have the exclusivity at WDW where as having access to all of these other resorts the resort is the draw not the location as much since there is likely 2 or 3 other options in the near vicinity with the same access to all the entertainment in the region.
I guess in my view I just see WDW as something completely different since they own a ton of land, have 4 of the top like 8 theme parks on that land, and have a fairly large buffer from other option. Like I said earlier the best I can come up with is like if someone owned one of the top vacation destinations by themselves except for more remote hotel/resort offerings.