Two points:
Pumas VERTREP single piloted. I don't listen to the other pilot -- just the AW.
The guy in the left seat on a SOF mission / CSAR mission runs the mission: Nav, Comms, FLIR......kinda sounds just like ASW to me.....
And again, the Brits do it.....and everyone has availability issues....
You "don't listen" to the other pilot because you are already a HAC and presumably won't need a little advice from your co-pilot since you are already where you are supposed to be doing what you are supposed to be doing. If a 2P didn't listen to your "suggestions" while still in the learning curve I hope you would boot his ass out and get another that looked just like him.
(And as a side note, VERTREP isn't really going to last as a fleet mission anyways.)
Personally, I don't see this changing because we wouldn't really save any money unless we left a seat empty. It isn't that we couldn't make it happen with a FO, it is just that there is not enough incentive to bother trying.