problem with Metamagic is that is now sorcerer only thing, shity if you ask me but what can you do.
They had to do something to make sorcerer a full class , right?
i think it would be better to just scrap those. We have too many charisma casters now.
This is why i like the classic video gaming approach they combined wizzards and sorcerers and just called them mages as it should be.

edit:
Do you really need a class that does basically the same thing?
one needs to learn it and the other doesn't, like what is that lol