Locals don't start arriving until 10 am or so. That's part of the reason that EE and early mornings are so nice at
Disneyland.
There are many reasons that locals aren't likely to pay to enter the park at 7:30 am. One is that "local" doesn't mean that someone lives down the street. Local refers to people who live anywhere from San Diego to the San Fernando Valley. Most local guests need to use a freeway to get to Disneyland and rush hour, or traffic in general, impacts how long it takes to get to DLR. I live 45 min - 60 min away. With traffic or an accident, it can take me 1.5 hrs. Parking, security, tram, combined takes at least 30 min. Then I need to get through the line at the turnstiles and into the park. If I wanted to enter the park at 7:30 am, I would need to leave home around 5 am.
Parking currently opens 1 hour before the regular park opening. Opening earlier for guests who drive means that Disneyland needs to open parking earlier. That involves even more wages for parking attendants and security at the structures & lot.
I don't think they will bring EE back. I think they will either provide another perk or play around with LL to see how many LL provide a perceived value. There are people who stay 5 days in a hotel but take a day off in the middle and don't visit the parks. If they offered one LL per day, could people bank them and use multiple LL on a single day? Or would it be a "you snooze, you lose" situation in that, if you don't use the LL on the day it is dated, it becomes void? Of course, this is hypothetical because they are only offering one per stay, not one per night.
I think the majority of onsite guests pay for LLMP.