I agree that it would be nice if more platforms facilitated this kind of exchange . I don't see Twitter doing this at all. The majority of my observations suggest ideas being lobbed at high speed, attached to a heavy object.

Besides that I'm unconvinced that this kind of platform for spreading new ideas is what most users on Twitter want from Twitter. The metaphor has become repeated so often that it almost sounds like it is Twitter's reason to be but I rather doubt that it was designed with that in mind.