My Mazda calls for 5k intervals for severe conditions and that's what I've been doing while under warranty. Now I'm doing 6.2k (10k KM) OCI's on PP, I'm not worried.
Plus, I would not trust quick lube places to perform necessary inspections, these guys operate at fast turn around, so shortening OCI's will not ensure that other items are looked at, cars would still have underinflated tires, be low on oil, coolant etc. even if we changed to 1k OCI's because majority of people are clueless.
It's a catch 22, clueless people rely on others to maintain their cars, so they think that when they bring their car for an oil change, everything will be checked then, quick lube places know that majority of their customers are clueless and will not bother checking their work, so they don't do it.