There are all kinds of studies on these things I suspect but personally I think small is good. In the same way that the canals were of great value in the early days...they were modest widths and used small boats that could be wound into factory wharfs without transhipment...so too smaller two story trams and more of them, would be good. Perhaps what was the original system was not far off the mark. High speed, multi unit and few lines is inferior I believe. A system of units, similar to the trams of old, with lines like the spokes on a wheel would better serve a city perhaps. Speed...you can keep it. Sure you need more drivers this way and more units but are not jobs in short supply. Better than working in a casino perhaps.
In the old days you never had to plan on getting to a stop in time. If you missed one tram another would be along in 10 minutes or so similar to busses now no doubt.