The rim argument is the only one that carries any weight for me. I would like to save the rims and no heat problems at the rim is a real advantage.
Stopping power? I don't want to lock the wheel with my dual callipers but I can. Is there any more to stopping power than that?
I also have no problem with stopping in the wet or pad life since I moved away from Shimano pads. If people still use these then I can understand if they are not satisfied. I found Shimano pads didn't work in the wet, wore very quickly, wore the rims and didn't have the best stopping power.
Disc brakes for road bikes just look like a complex solution looking for a problem while generating a few more of its own.
To move to discs we need different hubs to take the torque differences, different forks, a whole load of extra metal. Hydraulic versions need master cylinders. Maintenance increases. Weight increases. Aerodynamics decreases.