The departure of running back Seth Smith shouldn't be that big of a deal for NMSU football. That is, if Tonny Glynn and Marquell Colston remain productive in the Aggie offense.
NMSU was fairly high on Smith when he came out of the College of the Sequoias and joined the team this spring. They also seem to like Colston a good deal. It seemed like the team would use Glynn and Colston primarily with even a sprinkling of fullback Brandon Perez.
The only time that Smith's departure becomes problematic is if Glynn and Colston just don't produce or they get injured. The Aggies spent a lot of the offseason talking about a lack of depth. Well, Smith is a good example of a player who could provide that depth if need be. But no more.
I think the key will be Glynn's health. He proved, when on the field last season, that he was a big-play threat. A combo of Glynn and Colston should be OK. But injuries happen in football. It is something to keep an eye on. The hope is that they stay on the field.