I can't speak for the industry as a whole but most designers/companies I've talked to have moved away from Axure or have opted for other options like UXPin or Framer. I would imagine there are some larger enterprise companies who are heavily invested in this tool and still using it, but it feels like it's adoption is slowing down rather then ramping up.

This design survey could be helpful:

Yeah, I think that's pretty safe to say. That being said, in the past 3 or so years I've seen folks use Axure a few times for really complex prototypes that require logic, since tools like Invision don't allow for any kind of conditional branching based on the data people enter or button they click (except in a hard-coded way).

On the bright side, the standard prototyping tools people use today (with the exception of maybe Framer if you don't have coding experience) are extremely simple and easy to learn.

The last time I touched axure was 4 years ago....back in college.