Trackless ride systems have reached their peak with ROTR (imo). Everything about it is just genius and (arguably) perfect. It’s also not really all about said trackless system, it’s the combination of other ride systems like simulators and elevators. It’s one grand package like no other.
16 people max per dispatch, at a rate of about every 31 seconds. Now that’s severely reduced because of the one party per vehicle limit currently, but that’s looking to be increased to 2 parties per vehicle as Disney installs plexiglass dividers soon on the ride vehicles.
Trackless systems can be people eaters. A good example is MMRR. For the two or so weeks it was open before the closure it was eating a lot of guests and the line way always moving. (Or maybe I’m just mixing up things due to lack of FP+ maybe?, but there were plenty of reports saying that it was eating a lot of people and wait times were really quick)
Now with that, hopefully Disney can reinvent the wheel again like they did with ROTR and invest in some new ride system, or go back to older ride systems and reinvent those in new ways!