I haven't gotten a definitive sales count for NA or the US YoY for the last few years, but it appears Toyota continues to sell more 4Runners YoY, despite the aging (albeit extremely capable and attractive!) platform.

Toyota 4Runner US car sales figures

Pulled from above link, sales for US.
Toyota
4Runner
2018 139.694
2017 128.296
2016 111.952
2015 97.034
2014 76.906
2013 51.625
2012 48.753
2011 44.316
2010 46.531

I would imagine the Ford Bronco will impact take a bite out of this as I'm sure it will have a great suite of tech and even more nostalgia. That may force a next gen vehicle.

My wife and I were holding out for the first 4runner model year that had Car Play etc. We brought home out first 4Runner (2020 TRD Off Road Premium) on Friday night, and couldn't be happier. We both grew up with a Land Cruiser in our garage and love the feeling we get when climbing up into this tank.