If I was on life support, my wife would immediately come ... to pull the plug and collect the life insurance money.
At this time, there are only (2) reasons to not allow Mitch McConnell to be declared legally dead ... political and financial. The legal declaration of death is the demise of the current poltical paradigm, which leaves room for new, unknown political paradigms to emerge.
Man's greatest fear is the fear of the unknown. As long as Mitch is legally alive, interested parties can defer having to confront the unknown in public. They may already be wrestling with unknowns out of public sight.