I agree with the points that abandoning the Edinburgh tram extension now would see the most disruption for least benefit, but it’d be a brave politician that opted for further extensions for the foreseeable.
The view among many Edinburgh folk is that the trams, just like the festival and similar aspects of the city’s tourism industry, is pointedly not about them. The fact that the route includes the airport (visitors) - Ingliston P&R (visitors/out of city commuters) - city centre - Leith (gentrification) - Newhaven (Scottish Government/office developments) is not lost on those who live in Wester Hailes, Craigmillar, Silverknowes etc, all deprived communities for whom the prospect of a tram connection to the city centre is both way off and would likely be rejected even if it was offered.
The attitude towards the trams isn’t just about the trams themselves, but the fact that like many tourist destinations, Edinburgh is a two tier city where the local population feel like an unwanted inconvenience. The original tram works and subsequent extension are largely seen against this backdrop. It’d be great if it was different, but Edinburgh isn’t Nottingham or Birmingham. The population there (rightly or wrongly) are fed up of the city’s entire status and its impact on them, and the tram development has suffered off the back of it.