Well, depends upon how you want to qualify that.
I would say it's very likely that we see expansion of the items which are already restricted. This has already happened. Grand Cal was added back into Disney Collection, from which resale buyers are blocked. There was a recent addition to the Concierge Collection. And those who only own resale points have been blocked from member cruises.
Disney has every reason to keep improving the areas which are already restricted.
After that, the greatest likelihood (IMO) is the addition of NEW benefits from which resale buyers are blocked. Could be something as simple as a preferred check-in desk, early room access, etc.
Jim Lewis wasn't exactly the most member-friendly leader
DVC could have had (understatement of the year.) Others within DVC have realized that removing existing perks / benefits is the worst possible approach they could take. Not that there's a whole lot they could take away. Resale buyers aren't going to be held to their Home resort, or any other restriction of that magnitude.
That said, I'm not questioning the information on pricing. Haven't confirmed one way of the other myself but it sounds reasonable.
What I would question is your Guide's claim (commitment, promise) that you will be exempt from future resale changes. Two things:
1) Do you really believe that Claire Bilby, Ken Potrock or any other DVC exec gave the sales staff approval to take that stance on future resale restrictions with members and prospects?
2) If you do believe that happened, do you also believe that any future DVC chief will feel obligated to uphold that verbal commitment?
Your Guide may be right on the money with regard to pricing but she doesn't know a darn thing about future resale restrictions. Those claims are meaningless.