Barring the occasional generational type talent (like a healthy Todd Gurley), there are 3 inescapable factors at work here.
1. Even good RB’s typically are used up after 4-5 years. Years of evidence shows us that.
2. Good RB’s are plentiful in almost every draft right up to 6th and 7th rounds. Pacheco was a 7th for the Chiefs, for example.
3. Salary cap practically forces GM’s to draft the hard-to-find players at other positions first and then take the easier RB’s later.
And I don’t see any of the above changing anytime soon.