The design indicates that the radar and the primary optic/laser designator for engaging air targets can fold down, good features to have if there is artillery landing around for example. So, I don't know if it would make sense to completely remove the radar. Ideally the Army would have had the foresight to think these vehicles might be needed for their intended role again. I'm doubtful that ADATS was as unreliable as is sometimes claimed, in the real world it only entered service in small numbers with the Canadians and I'd guess those units were pretty low on the list for any sort of funding related to supporting or improving their systems. Who needed short range air defense back in the early 2000s? Nobody invested much in it at the time.
Using the MIM-146 solely for ground targets is a very expensive prospect compared to many other missiles, especially if that target isn't an armored fighting vehicle of some value. But it's possible the missile 'launch bays' could be repurposed to launch other missiles. I'd expect that primary optic could be used for a SALH function even though I think ADATS was a beam-rider. That would make Hellfire an obvious choice with a variety of different warheads available.
As far as I know this design never got beyond the proposal by two engineers, so there are some things that seem a bit "off" and a whole lot of detailed design work and refinement that would have to occur. I believe they underestimated the size of the ADATS missile for example. Hopefully they could fit four each in those missile bays but I'm not sure about six.
IDK if that Metal Storm variant is just something someone made for Reddit, or a real idea the Metal Storm guys had (questionably using an Abrams variant that never made it beyond some drawings). Considering how odd some of the ideas they threw out there were, I wouldn't be entirely surprised. It was always a technology that seemed to struggle to find some viable use, and I'd say that one in particular wasn't one of them.
