I think Metamagic is basically the main reason for playing a Sorcerer over a Wizard (a second reason being perhaps being attracted to one of its subclasses) and it's not even a very strong selling point. Metamagic feats would kill the Sorcerer class for the rest of the edition, unless they were meant strictly for the Sorcerer i.e. they would require to already have a source of spell points. This would not be a bad idea in fact, considering that Sorcerers get quite few metamagic effects overall.
AFAIK the game still doesn't have any options for creating magic items. Feats could be one way to implement such option, but not the only way (a subclass dedicated to magic item creation is another way, but then it only works for one class). I actually think this was probably considered by WotC, but then put on hold until they decide better how magic item creation should work i.e. if it should have metagame limits on the number of existing items, and what kind of costs should be required.