Even travelling through a lot of small towns in rural areas I don't think I've run into a magstripe-only reader in the past couple years at least.

There was a period where it was a guessing game every time you paid for something whether it was magstripe or chip (some locations even had a chip-capable machine, but didn't have the service enabled with their payment processor, so you still used the magstripe...).

It's pretty consistent now.