It is good that from the next update, there will be a mana cap at 80 %. But this is NOT going to stop T0 wins in PvP, as is being expected, as long as Fallen Rings are kept as it is now.
Though the chances are very low, it is still very much possible to kill the opponent with just one spell. So if you are trying to make PvP better for all players, do the necessary correction with the Fallen Rings before the next update.