That's an aspect that makes dumping ME such an odd choice. It helps preserve your captive audience. The first time I went to WDW I was 10, and back then there was no ME or uber or whatever, I don't recall for sure but I am pretty sure my parents rented a car. But that let us stay wherever, and just drive to WDW. Fast forward to 2019 and we went with some friends who are basically annual WDW visitors, and they introduced us to ME and we just took it to Caribbean Beach Resort, didn't once think about a car or other transit our entire stay, and ME back to the airport. Now when we go in November we are discussing maybe renting a car, or what the other options are. But once you start paying for other options anyway, then Disney loses that captive audience aspect, people start seeing what else is available and heck, if I have to rent a car may as well save money and stay off site.
Won't be an impact for DVC owners, but I would think if even 10% of visitors give it more consideration it will be evident it was a mistake. I want to say time will tell, but I don't know if we will ever know if taking away ME actually hurts Disney's bottom line or on site visitor numbers, between Covid and that, the normal visitor numbers are all over the place compared to normal.