The issue of capacity is one that's always rooted deep in the ride system selected. Unfortunately, there is a perception (valid or not) that a modern E-ticket means dynamic/kinetic ride systems. That unfortunately limits the options available. For whatever reason, classic capacity heavy systems get excluded from discussion because they are perceived as being the wrong tool for the job at hand.
Going to larger RVs isn't always possible as when they become bigger the center of gravity changes as you move towards the edges. Larger RVs also introduce operational issues of feasibility and maintenance as larger means more mass and moving large, heavy objects quickly means more energy and stresses involved.
Going to more RVs isn't always practical from a show or cost perspective. There are ways to get creative with more RVs into a smaller space (like Hunny Hunt); but, it ultimately depends on the story trying to be told and if interacting with more people/things makes sense.
Disney was limited in the number of options that meet the criteria needed for the two attractions in SWL. Some of the choices available like the EMV or the TT/RSR platform couldn't be used as wheels in the SW universe aren't allowed (yes, there are expections in the Republic Troop Transport). Perhaps the best modern option for higher capacity and more kinetic motion is from Shanghai's Pirates; but, that wouldn't lend itself well to SW either.
Of the options available, the LPS RV for Alcatraz was the best choice for the job at hand there and the carousel of simulator pods for Big Bird the best way to do the Falcon's cockpit. Making the ride longer for Alcatraz and adding more carousels for Bird unfortunately wouldn't be possible due to the space constraints of Disneyland where it was designed to fit.
When I was first told both were going to be over 1600pph, I was happy because recent Parks choices were so terrible. Ultimately, I look at what we are getting to be the glass mostly full from a capacity standpoint. Adding another 800pph would've been great; but, in the long run - the quality of both attractions will be high enough to make it worthwhile.
So, the next time you are at Universal be sure to take time to appreciate how remarkable Forbidden Journey really is as a ride system (and not the projection domes they were stuck into). It is the modern Omnimover that unfortunately Disney never got a chance to play with. Just imagine amazing more attractions could be if we go more rides developed around it.
Still... I would love to see Alcatraz's dollars put into a classic Omnimover at some point.
