First(not aimed at OP), i think it's absolutely asinine to eliminate any position, any year, in any round unless it's a kicker, punter or long snapper. Second, I don't think you should worry about a second contract that is at least 4 years, and likely 5 years away. You look for talent and worry about whatever contract dilemma you run into in the future. Also, it could be looked at from a different angle. Drafting a RB in Rd 1 gives you a 5th year option. This could be extremely useful for the RB position in general. You get 1 extra year of cost efficient team control and can walk away from a player who you got one more prime year from. It also prevents needing to do a long term deal for a year while preserving franchise tag. Wouldn't most people have loved being able to keep Murray for one more year on a team friendly cap hit, while also having the tag for Dez?
I'm not saying aim for a RB in Rd 1, but it shouldn't be eliminated by any means. Stick to BPA, and let the talent sort itself out.