And how many of those guys, in hindsight, should have been taken in the 1st? Rchardson, Wilson, Best, Brown, Moreno, Wells, Mathews should not have. And besides Richardson, they aren't going very high. I would take Morris over anyone there except Martin, and McCoy over anyone there.
You could play that game with QBs too
QBs taken in the last 5 years in the first round
2013 - Manuel
2012 Luck, RG3, Tannehill, Weeden
2011 - Scam, Locker, Gabbert, Ponder
2010 - Bradford, Tebow
2009 - Stafford, Sanchize, Freeman
Who of those should have been taken in the first? Weeden, Gabbert, Ponder, Tebow, Sanchize, and Freeman shouldn't have!!!
And also WTF that Richardson and Moreno shouldn't have gone that high, do you know nothing about scouting? Richardson was hailed as the next Peterson. Moreno was maybe a smidge of a stretch but no way he would have fell out of the first.
And for every McCoy or Morris, there are plenty more Glen Coffees or Mike Goodsons, or Montario Hardestys.
The whole "don't draft a player high cause other successful players are found lower" can be applied to literally every position in the NFL. QB, WR (Wes Welker or Jordy Nelson anyone?), OT, DE.
Fact is that NFL prospects bust sometimes, and other times you have surprise players. It happens every year at every position. You don't look back at the 2010 draft, see that Brandon Graham was a total bust and swear off drafting DEs high. Or see nearly Franchise ruinign busts like Ryan Leaf and declare never to take a QB number 1. You just don't do it. You draft the best possible player.
The "going away" from drafting RBs has to do with 2 things. First that their careers are shorter and your goal for a first round player is to take a franchise player. Second is that the NFL as a league has been moving away from having impact runners. So they've not been as in demand on the team level so they're not as in demand on the draft board. Saying that teams are moving away from RBs because they're dumb to pick in the first would be like saying they're moving away from taking nose tackles after switching from a 3-4 to a 4-3.