I love this stuff. I deeply enjoy watching technology develop and become more efficient. This feeling is something akin to watching your kid drive off to college: I'm probably not needed as much anymore, but I'm pretty excited to see how far it has all come. That doesn't mean there isn't a selfish pang of nostalgia for how things once were (and a little bit of existential fear for my future financial wellbeing).
> it's starting to look like I may not be needed on the bleeding edge at all.
If it's any consolation I'm pretty sure this has been a theme of worry for hundreds of years, if not since the beginning of technology. Thankfully humans are extraordinarily adaptable (and bad at future prediction) so a combination of evolving our skills and failed promises means there's probably going to be a lot of work for us to do for a very long time.
> I'm probably not needed as much anymore.
I think this too is just part of successfully doing your job. And getting old. Hopefully you get to move on to new things as you hand off or automate the old. And then someday you realize that the twenty/thirty-somethings are really sharp and maybe woodworking ain't so bad after all. :-p
Really, if you're not okay with your job description evolving substantially every 5-10 years, then a career IT is going to be a source of a lot of stress for you.