I am an individual paying $850, but that doesn't mean that my family gets in for free. They also pay for their tickets as well. I may not always stay on property, but over my 30+ trips my family contributes more to Disney World than that family of 4 or 5 would spend on their trip every 3.75 years. There is something to be said about catering to your base as well.
What's happening now is no longer the $100 ticket debate, but potentially closer to the $200 ticket debate. If you have to stay on property to achieve the same benefits that were previously available to all guests than the cost of staying on property and the associated perks need to be factored into that price. This, more than anything Disney has done in recent memory has a much stronger possibility of guests voting with their wallets.
I know NextGen is coming to Disneyland as well, but I can't see them making Fastpass+ a perk only available to Resort Guests in Disneyland. It will undo all the goodwill that has been fostered since the 50th anniversary. Disney World now, is where Disneyland was in the early 2000s and they're looking at a change that will be highly disruptive to guest touring and guest satisfaction.
Yes, I understand that people should be allowed to pay a premium price for premium content. But when something that was previously available to all guests is no longer available, people dissent. This has the potential to be very disruptive, and while technologically speaking it may be a step forward, from a guest satisfaction standpoint it will likely be a huge step backwards.
It is far easier to retain an existing customer than it is to get new customers, especially when your nearest competitor is kicking your a$$ in building appealing attractions.