Well that all depends... What is the point of the mission? How many missions are we talking about? Do we have places where the a larger starship would be better suited? Do we have GCS to spare?Intrepid is probably far more cost-effective for less lengthy exploration and/or outrider duty; but if you had to be on one or the other for 7 years, would you pick the GCS or an Intrepid?
I'm not saying that there isn't a use for the GCS, I'm saying that I don't feel the need to continue building them. First off we seem to have a fair number of them already. Second, if the mission is just to chart new systems or the likes then I wouldn't waste sending a GCS. If the mission is to cross the DQ, then I would send a GCS. It all depends on the mission. But, again, I would feel the need to justify the cost.