There are two components to consumer response: Intellectual and emotional.
Intellectually we've been telling people for years that "perks could go away at any time...don't buy for the perks!!" In that regard, little has changed. Except for people who may have been willing to roll the dice and bet that they would get SOME perks for SOME amount of time.
On the emotional side, perhaps some people will be so offended by this that they'll refuse to buy. Frankly I think this number is fairly small. Even without AP discounts or the other smattering of perks, buying AKV or SSR points resale is far cheaper than paying cash for the next 30-40 years.
Disney will package this move as perks being a reward for owners who choose to buy direct. And it's hard to object to that. For years Disney has offered sales incentives to direct buyers, most notably the 8-9 years of free theme park tickets for some of their very first customers.
Back in 2011 many people argued that the original resale restrictions would cause the bottom to drop out of the resale market. Yet here we sit with prices as high as ever despite every contract having 5 fewer years remaining. One could argue that resale prices would be even higher if not for the restrictions, still the most dire doom and gloom scenarios never came to pass.
As good as the AP discounts are, I don't think buyers put enough value in that for the resale market to take a huge hit. In fact, people who really want those discounts will probably just buy some modest amount of points direct.
Meanwhile, if DVC plans to continue offering new and appealing perks like the exclusive theme park nights, lounge, etc., it will be a nice bonus for owners who choose to make themselves eligible for those perks.