While nice at first thought, dual qual is not as easy as some of you think. I have flown with a lot great dudes who are dual qual, and these dudes happen to be some extremely high functioning human beings - as in way smarter than the rest of us bottom 99%...and capable pilots as well who do fly tactical missions in each type. There's about two of them I would even remotely consider capable of going to combat in one of their MDS in their current state (i.e. without picking an MDS and spending 3+ months getting spun up on how to employ well). Now just imagine asking an average dude to know two separate sets of TTP, different mission sets, etc. (who cares about the motherhood/systems GK...don't care, that's easy).
Bottom line, you will predominantly end up with below average MQ-9 guy who moonlights as a below average OA-X guy. Not because he's necessarily terrible as an individual pilot, but because he can't execute two different MDS well; he can execute one at an average capability level. I know some of you can likely point to a guy you know who could probably hack it alright, but it's not about that one guy, it's about the idea of an entire squadron executing in such a manner, and by the way, that entire squadron is not made up of well above average pilots. This may not have been an issue 30 years ago, but shit is complicated now (for everyone), so there's a reason flying multiple types of aircraft as a CMR CGO/young FGO doesn't happen anymore.