I don't think so (surprise, surprise).
The town hasn't altered significantly since it actually had a trolley bus and tram system, for instance. Same big wide thoroughfares, for example. Plus, the town's an ideal size for a good tram system. No reason tram lines couldn't run: down Lloyd George avenue to the bay; along Newport Road and up Rhymney Hill; Along Castle St, Wellington St, and Landsdowne Rd, and Cowbridge Rd West or grand Avenue to cover Ely and Canton; Up Cathedral Rd and StationRd to cover Pontcanna; and Llandaff North and Caerphilly Rd to cover Heath. I think there also used to be a tram going down Crwys Rd, Witchurch Rd, and City Rd.
You do that alongside a congestion charge on cars, cheap park and ride, and increased car-parking charges in the centre it'd be cool. There'd be less cars, a good public transport option, and more space on the roads to cycle if you want to. This is a wet dream, though, and would be expensive. But what a legacy for some aspiring politician/mayor! I would settle for cheaper, more reliable buses at the mo, though, I must admit.
At the moment they're increasing car parking charges without offering an alternative, which sucks.