It may have fallen into the category of weapons too big to lug around, and inferior to vehicle-mounted systems. That's happened before. About 10 years ago, the USMC was trying out an "automatic mortar". This accepted fire direction like artillery - forward observer designates target, data is passed to weapon, weapon duly clobbers target. Worked OK, too heavy for infantry, and there are vehicle-mounted systems already deployed which can do that job.