Fixed guideway systems are fixed guideway systems, with two rails or one. It is the same problem of having to choose between "access" (sufficient stops at locations where people desire get on and off, at, or near enough to, the locations they wish to have access to) and "trip time" (total time in and out of vehicle time that is required to make the journey from where you are, to the station, onto the vehicle, off, and walking to where you want to be). A "monorail" does nothing to change that equation.

"Modern", "futuristic" monorails are nearly two hundred years old as a technology, and yet, we mostly have those "quaint" two rail systems.....? Why is that? Some would answer that this is an example of the vast evil "bi-rail" conspiracy to stifle modern innovation, by the evil contractors and politicians (aka "evil" gubmint). Others might look at facts, like cost benefit, operational efficiency, competitive markets for equipment, like rational adults.

These days there are even some popular "modern" "visionaries" out there, who would have you believe that electro-pneumatic tubes will soon magically "levitate" and whisk you everywhere you want to go, and these will cost "almost" nothing to build, operate, or maintain. so if you have some investor money just lying around, these "futuristic" "visionaries" are looking for "investors" for their "visions", too....

For every complex and real modern problem we face, there is always seems to be some "new" "futuristic" "visionary" simplistic solution being promoted, that always seems to promise easy solutions to complex problems, if you are just willing to "believe" hard enough.... Kind of like Tinker Bell...

Where we've actually have the conditions to support it, and actually bothered to build good quality "fixe guideway" rail transit, providing good access, to where we want to go, in reasonably frequent service and good travel times, many more people actually do use it every day, than ride the Disney monorail or Big Thunder Mountain.

Our problem isn't our lacking of the "right" ("sexy") technology, it's more about our failure to do much of anything anymore as a nation, with regards to building and maintaining our needed infrastructure, except to whine and complain about it (or listening to Ken and John whine and complain about it on talk radio), while we sit in traffic wasting our time.