There are plenty of ed abilities/dragomarks that can enable non caster classes to cast spells. However, if you want to take metamagic feats (witch are only restricted to player being able to cast spells) you will still need to multiclass with some of the caster classes.
It does make some sence from a lore perspective... On the other hand any caster can take power attack/cleaves with no multiclass required witch is also kinda sensless.
I think this should be fixed. Your thoughts?