I do own an affected 6.2l and I trade every 2-3 years but if I were one that holds on to a vehicle longer that special warranty extension would be great. In my case, I'm going back to a diesel again for the cheaper fuel cost and better mpg. NOT, because of this engine deal. There are a mess of 6.2l equipped trucks and SUV's in my sub and I see them tooling around daily. The vast majority of owners will have trouble free engines. GM just needs to get their act together and replace a blown engine quickly with high priority. If they can get owners back on the road with a replaced engine within a 2-3 week time period I see no need for panic.
F150's also blow engines. Rams blow engines. I flew to Detroit from Florida and bought a 1999 F150 Lightning the first month it was out. Drove it back to Florida and the engine went south during my first month of ownership. Ford sent a complete engine, oil pan to supercharger, and I was back in the truck within 3 weeks. I was disappointed, sure but the truck never gave me another issue after.
Anyway I'm good with the recall. And, I think it will be a selling perk to used buyers going forward. I'll be trading mine and don't expect any trade dings on the appraisal because of it.