There's been room in the budget for me to upgrade my work MBP for about 6 months. I haven't considered it. I've got the old keyboard and I've seen what my coworkers have to deal with.
I've also convinced my wife to wait on replacing her decade-old MacBook.
Hmm, that's probably also a big part of it. A good professional-grade laptop can last for years. I've had my 1st gen Surface Book for about three years now and it's as fast as the day I bought it. Unless something breaks, I have zero reason to upgrade to anything different.
I'm in the same boat as you at work. I've got an older MBP, and despite a dent in the screen and some trackpad issues I would rather stay with this model than upgrade to a newer, inferior one.
I've also convinced my wife to wait on replacing her decade-old MacBook.