My opinion is right in line with Seaman.
I think the HUMVEE is still a very good, strong, vehicle. The problem is that ONE of the jobs it is being asked to do, it is underperforming.
Therefore, get a vehicle to do that ONE job and keep the humvee for all the rest. I think I've been writing about the need for an urban combat vehicle since I got here since the HUMVEE has been proven to be relatively ineffective at patrol.
However, there are a great many tasks for the humvee and that the humvee does splendidly.