No perfect answers, only options and choices, tradeoffs and sacrifices. Just saying that if choosing between no mortar due to weight and three-man team size, or having one of these with 12-15 rounds distributed, among the element, I'll consider one of these, mission dependent.
Of course, they are not an option for me now, and my grunt life was a looong time ago. When we were prepping for air assault into Haiti, one of our mission was to take down the airport. Indirect fire was a challenge due to the weight, team size, time to deploy, etc. I could see these being a good solution for that application, and better than 40mm.
I agree, another tool in the box. But, We do have to consider the integration of the system into the scheme of maneuver. IIRC in Iraq we were clearing our own 60MM handheld fires because the max ordinate was so low. I suspect that would be the case here, but I would defer to one of our LF Fires guys or mortarmen.