I think it would really improve the game if Synergies existed. This means that two schools on the same team will give unique buffs to that team.
Such as - A and on the same team may give +20% critical block to both wizards. A and may give a +5% damage increase to both wizards.
And possibly - and gives +25% healing to wizards below 3000 health.
This may also gives many schools a chance to gain a lot more utility. Such as - gives 13% more pierce to all allies, or gives 8% resist to allies, reduces healing by 7% for the enemy team, increases healing by 7% for the allied team.
This could, again, lead to good combos between schools.
and on the same team increase ally healing by 9% and reduce enemy healing by 9%. and could do 30% more damage to stunned enemies.
Of course, the numbers I call out here are just theoretical and of course are not a final draft of any form. I do think, though, that this can make PvP and battling in general a lot more intricate and allow us to see some really cool strategies in multiplayer going forward. Please tell me what you think and, if you would like, suggest possible synergies that could really shift the meta ground of Wizard101.
and 
on the same team may give +20% critical block to both wizards.
and 
may give a +5% damage increase to both wizards.
and 
gives 13% more pierce to all allies, or
reduces healing by 7% for the enemy team,