Your question made me dive into data to see how many guys are rushing / being targeted in a given % range, over the last 2 decades: https://twitter.com/JMoeller05/status/1391062354826129408

In a general way, 60%+ RB rushers are a dying breed, as our friend said in your tweet

https://twitter.com/Coachfootball19/status/1391146629386756098

Putting that same data in 10s, we see that the 60%+ guys are decreasing in every tenth. I'm waiting for 2021 (or the fisrt non-pandemic year) to see if that trend continues or just keeps a low number of bellcows still findable

There's more "stability" and chance to grow in the passing game, and we should pay real attention to those who can hit paydirt here (as most leagues are PPR in America)

So who are the workhorses?

Christian McCaffrey
Saquon Barkley
Austin Ekeler (2020 should've been his year)
Aaron Jones
Ezekiel Elliott
Dalvin Cook
Derrick Henry
Joe Mixon

Their shares are too high with zero or bad competition

Other guys like Alvin Kamara, Miles Sanders, Chris Carson, Nick Chubb, Mike Davis & co. might score a bunch of points eventually, but with less volume (and more TDs).