O-line is part of the equation. On the flip side, Brady still managed to throw for over 500 yards with the same blocking that allowed pressure (yes, there are technique and scheme differences between pass and run blocking, yet still the same set of players). Elite RBs can often break those long runs with great cuts, better acceleration, reading the field/lanes, etc. It's something I notice with Elliott is his vision and the cuts he makes.
It can be argued the Patriots would have won more SBs with a back forcing the defense to play the run with more caution, and thus opening up more passing lanes. Brady has never played alongside an elite RB, a type that could grind out yards and clock late in games, or break a long run at any time.
I'm 50/50 on both arguments on the RB "value" in today's game. I'd wager had NE had a top 5 pick in 2016 and Elliott was there that BB may have drafted him, or he may have coveted Ramsey which seems more of a BB pick. I preferred Ramsey and wanted Dallas to find a RB in the mid rounds, which is where Chicago found Howard in the same draft. Reason being that elite CBs are more rare than elite RBs, Dallas needed defensive studs more so than offensive, and that with Dallas' O-line they could get by using 2-3 solid RBs splitting carries and Romo's play (he later suffered a season ending injury in preseason); they had McFadden and had signed Morris, plenty to carry the rushing game alongside a likely mid-round draft pick. Also, Ramsey will likely end up in the HoF, Elliott most likely will not.
I guess my take would be draft a RB in the top half of the first round if said team has that position as it's top need and a best player on the board is there (not a reach selection), and say they were maybe a year removed from the playoffs and had a slip up, or traded up to get a potential elite RB. Like per say if the Rams scored a top five pick and Barkley fell to them - take him as he's likely the final piece on paper.
Edit: Rams have Gurley, disregard that. Find another club almost there, like say the Vikings with Cook's injury in play.