Well the new school plot is something that wouldn't have worked all that well. Basically either Kuzumi would have gone away and started studying magic properly, in which case every other cast member would have disappeared, or he would have come back with a gold plate and destroyed the main dynamic of a guy without magic using his brain and brawn to survive.
Now what I really want is a special that serves as a true ending, with Kuzumi coming back to his friends with a real gold plate after a year. Hikago, for example, had a very unsatisfying ending that was improved afterwards by two specials.
Clearly, though, the whole thing about the black Mx0 was a set-up for lots of chapters that never happened. There was even a bit about how Kuzumi would get in trouble for not realising that using Mx0 would erase the absorbed magic that never came to anything.