Nah. It's not dead
There's just a lot more PEOPLE on the planet, so whatever activity you choose to undertake there will be a lot more people trying to do the same thing than there was a few years back.
I expect it just makes it increasingly harder to find those quiet, out of the way spots, as no doubt a lot of those are getting busier & busier year on year - this is from someone who currently hardly ever gets away in the camper, so ignore my waffle if you want!
If somewhere becomes not nice to be any more I guess you just have to keep moving until you find somewhere else that is.
And I'm dead certain there are still lots of lovely, peaceful places out there to discover. All depends where you're looking