If and that is if you never ride when wet when rims are ground down really fast, yes rims will last a long time with rim brakes. However if used most every day wet or dry, they can wear out really fast. A broken rim put you on foot for maybe a long walk home.

My reason for supporting disc brakes are the fact that without rim brakes, rims can be made stronger and with a more aero profile. And the elephant in the room, disc brakes dont wear out expensive rims. May I remind you that probably many on this forum ride on a rim set that cost more than a large percentage of lower cost bikes.

Lastly with some buying carbon rims, rim brakes dont work very well. And any those against rim brakes appear to be on the losing side. More and more mfg are bringing out road bikes with disc brakes. Probably in 5 years they will be pretty much standard.