The decisions Disney is going to make will be initially guided by revenue. That is my speculation. With limited capacity, that means fewer bodies paying admission to get through the turnstiles, fewer guests buying food and merchandise. While this is an unprecedented situation, that doesn't mean they're just going to throw out their entire business strategy. Their goal in the last 5-7 years in particular has been to maximize guest spending/revenue per capita by A) capturing all available revenue points throughout a guest's vacation, B) attracting guests with higher disposable incomes and higher spending power and C) finding guests who will exercise that power to the greatest practical extent in a condensed period of time (making "room" for the next set of spenders). That's why the resorts are so valuable to them. That's why Disney created the 60(+10) FP+ window. With park reservations, I would expect something closer to the FP+ system than the ADR system.
Will there be a lot of unhappy/nervous local APs and offsite guests? Yes. Will there still be room for them? Yes (that's why Disney is restricting occupancy), but they want the great majority of the guests in the parks to be those in that "maximum guest spending" category. I understand the frustration from that local poster, but from Disney's perspective, she/he is not a huge immediate revenue generator, and that's what they're really looking for right now (it's going to be a long recovery for them). No matter how much she/he spends on limited time merchandise or food, that pales in comparison to the revenue generated by lodging and three meals a day. It's the same reason why he/she had a harder time getting on SDD or FOP. Her/his "friend" in a Disney Resort would get priority for that ride under the old system.