I agree that fishing should get a rework. But I do not agree with your suggestion of requiring additional skill points.
Fishing should not require any skill points at all. It should be similar to the 2nd job system.
I don't like the idea, that I do require a second character to gain access to pearls, without waisting a skillpoint.
I also don't like a system, that rewards me for beeing AFK, but thats another topic.
However, I like the idea of getting some kind of special rewards than can be aquired by fishing. Like non-tradeable dresses or accessoires