I for one heavily endorse more fluid alignments as it gives you the impression of actually shaping the world around you, which is (or should be) the whole point of RPG (right?).
Even in BG2 there were a few characters that could swing either way based on the PC's influence and DAO further built on that while dumping the classical alignment tags.
If you really NEED to equip them with tags, what actually classifies Wyll and Gale as neutrals in your opinion? They (especially Wyll) will mostly go out of their way to help everyone you meet, with Wyll even leaving your party should you choose the evil way, sure their backstories are somewhat dodgier but shouldn't "good" be defined by acts rather than "tags"?
Am I looking forward to some "Butt kicking for goodness"? Damn right I am. But do I want a whole party of one dimensional characters limited by their alignment tag? No thanks, I prefer them the way they are now.
