I don't think it's reasonable to increase the minimum past what a new purchaser would need to qualify and that's currently 50.
I don't see them raising it more than that because small point sales are the backbone of $170 points. The point is to spur new sales not discourage them.
So. I think 25 will work for now or they should have said something by now. I wouldn't be surprised if they do move it to 50 to qualify.
I do think 50 is worst case.
For example, if they decided it takes 100 points to qualify resale points but 50 can get you a new contract with benefits, then the advice on the forums would be to buy direct first at 50 and then add resale. Resale buyers are much more likely to see what's being said here before buying.
In any case, it's an open debate NOW whether it's worth a 25 point add on for what's missing. I think it would be. 50 points strains that incredibly. Anything over 50 points will make it moot, not worth it without a doubt. Again, the point of this mess is to sell points. I think
DVC will be quite happy with hundreds of 25 or 50 point contracts as a result of this change (combined of course with the ability to further discourage resale as a talking point at the point of sale).