Well, we seem to have two lines of thought here- the "Rim brakes are just as good so I don't want discs!" and the "Discs are so much better that it'll be dangerous when other people have them!". I can believe either side, but not both at the same time, so y'all need to get together and get your excuses aligned.

My experience with disc brakes:
1) They stop okay, but I've never skidded a wheel with one (but have with a coaster brake).
2) They don't strike me as grabby, so issues of running into noobs that brake strike me as a non-issue.
3) They do require periodic adjustment and stuff, they're not as maintenance free as it sounds (this on Avid BB5 road disc brakes).
4) People don't generally swap out rim brakes for discs, so you'd be buying a whole new bike when you changed, so issues of redesigning a bike or fork for discs are pretty much non-issues unless you're a manufacturer.
5) The only complaints I've ever heard from users of rim brakes were when it was actually raining during the ride, and even then, it was only a few out of the whole bunch that were having issues.
6) When you do work on a disc brake, you can't see what you're doing very well- the moving parts are smaller and more concealed.

Something to keep in mind is that with rim brakes, you can make the brake assemblies, the levers, the pads and all as big and beefy as you want. You could put a 3' lever on the top of the frame where you could crank it down and an elephant couldn't budge that rim. If a rim brake has marginal braking power or doesn't work when wet or overheats, etc, those are all design issues caused by making compromises in the design, and are not just something automatically associated with rim brakes. You can make disc brakes that are inadequate in one situation or another, too. And if they squeeze every last gram out of a disc brake, that may be the very one that has the worst issues.