I'm driving a 30 year old K5, with 90% of that being 30 year old parts. It doesn't drive like a caddy, I'm sure my entire front end and shocks/springs around need to be replaced, but it runs and drives and won't leave me stranded. A modern day 10 year old truck is nearing mandatory parts replacement, and it's expensive. I don't like the idea of replacing an entire hub assembly because the bearings are shot. I like spending $10-15 on a bearing and race kit and doing it at home, with simple tools.
I think a restored and updated K5 would be nice, all original except I guess toss in a modern motor. But ya can't, like said previously, today's modern requirements. Now, if a shop bought 30 K5s, fully restored them 100% with some nice updates, and sold them for 30-60 grand like a modern brand new truck, and you could finance like a dealership with warranty. Yeah, I'd dig that. Your choice of engine, modern interior, basically all the things we'd like to do.