On the other hand, it's basically an animated rock. What do you get when an animated rock "goes limp"?
A rock.
Actually, here's a pitch for the DM. You take EWP(psicrystal), where it's for a 20ft range increment, 1d4 damage (even for small creatures, as all crystals are the same size category), and can deliver touch attacks for you, because it's still your psicrystal.
I think the feat and the further necessary commitment to throwing balances that pretty well.