tl;dr.
No, I'm not replacing my rim brake bikes, but I'm also not riding them in the rain, and the older ones from before dual pivots I'm not planning to take down any steep, curvy descents. This is not to say that rim brakes are inadequate, but in the wet, the sound of dirty pads scraping metal off my rims is unpleasant and sounds like money I'll have to spend down the road, and yes, I HAVE worn out rims before.
Does this make me a serious cyclist? I don't know. I tend to see myself more as frivolous.
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"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles