I honestly dont think that they can lower it - if they could they would have done it.
After the FL stat 718.110 came into force in 2021 the ship has more or less sailed for DVC in terms of restricting the number of times owners can rent. They can restrict it for future owners, but that doesn't help them with the current ones.
That might also be why we haven't seen an updated policy - any limitation would require a vote, and only apply for those in favor of it.
DVC and owners for that matter is more or less stuck with what we have.
I am not sure what DVC is doing, but it's definitely not this. I think what constitutes personal use and commercial use are valid subjects to debate, but it is very naive to debate what power DVC has granted themselves. It's spelled out in so many different legal documents that you've signed that I haven't really seen a lawyer here dispute that DVC's power is significantly more than they've chosen to wield (up to this point). They are most certainly not negotiating from a position of weakness. The only legal position I've seen those knowledgeable in legal matters all agree to is that DVC cannot get rid of all renting, because that is baked into state law and also the contracts we've signed. The limits they can put to that renting are vast, undefined, and as of now, underutilized/not utilized. I am not sure if this is a coping mechanism for renters, but DVC certainly is not "stuck with what we have".