I don't have a problem signing a veteran RB, but my preference is for a draft pick in the mid rounds. Sure, I'm devaluing the RB position ... but that's how I feel about it in today's pass-first NFL. How much of an upgrade is he over the Myles Gaskins and Salvon Ahmed types we have on the roster already? Is he a 7M+ per year upgrade? IMHO, maybe not. He wants 15M per year, but FA RB's get Melvin Gordon type contracts, so he's likely to get under 10M per year, which is the only reason I'm even remotely interested.
Salary cap management means finding those spots where you can get by with cheaper players. IMHO, the RB spot is one of those places. Now if we add a Travis Etienne or Najee Harris, that's 4 to 5 years of stellar RB play at a time when they have less mileage and greater durability than a FA, and for a much lower salary. If we need an upgrade at RB, I'd prefer to draft one.