And yet bus routes don't change that often. Let's say it would take 10 years to change a trolley path (an insane time frame but it's the usa so...), I don't see

And yet bus routes don't change that often. Let's say it would take 10 years to change a trolley path (an insane time frame but it's the usa so...), I don't see any bus routes changing 3x a day. It is easier to reroute but the difference is only really like 2-5x. And with the trolley you can actually be confident of it showing up on time :)