@Meddler, Without Mana Pots, Morgana's Passive will be Useless
Morgana's passive is already underwhelming - just look at the attached image where she can do more damage than anyone in the game...and heal less than everyone in the game. It doesn't provide as much sustain as you would hope, especially given how Morgana's main source of damage only returns 1/3 of the value of her passive.
Without mana pots, the situation is going to be even worse. Morgana uses a lot of mana to farm and heal from her passive; without mana pots she will run out of mana rapidly and not be able to heal from her passive much at all.
Is Morgana's mana usage or passive up for changes with the removal of mana pots?