What choice does the judge have really? It's pro-forma for him to accept this motion. What's the alternative? Tell the prosecutors that they have to continue to prosecute a case that they have lost faith in? Where they may have cheated? Which has been independently reviewed and found wanting?
It's hard to imagine what it would mean if he did not accept it, from a practical "how do we proceed" point of view. So, he will.
But he might do much more. He might castigate the prosecutors. He might delay accepting the motion to dismiss until they complete production of exculpatory evidence, which they are currently supposed to be completing. He might refer the prosecutors for sanction, which I believe this judge did in the Sen Stephens case.
I think the main thing he can do is "pile on the prosecutors and kick them when they are down" -- and I sure hope he does!
WOW! I am loving you so hard right now....