You guys should just get rid of MCL. It's mostly useless, and tedious or confusing where it's not.
Useless: Nobody's going to start using a newly uncapped regular fireball in their rotations, as later options (DBF, meteor swarm, etc) are still vastly superior.
Tedious: keeping track of MCLs is not easy, as they are split across various channels (by school, by element, etc) and sources, and are not tallied up anywhere.
Confusing: self explanatory, with countless examples including this most recent one on these forums. You guys should make this game more straightforward to understand for veterans and newbies alike, especially if you hope to attract more new people (MCL is just one item to streamline).
Overall, MCL is an unnecessary layer of complication, and its removal could be balanced out in other ways in the few areas it would actually matter.