Ideally, crafting should be something that is enjoyable throughout a character's journey and not solely a max level pursuit. There's something wrong when more and more people are considering amassing massive amounts of credits and materials for a Level 50 crafting splurge. However, that said, perhaps instead of nerfing Slicing, the other skills could be tweaked.
I hesitate to reference other MMOs, but really, there's no other way around it. As another post above mentioned, EQ2 had a great system where every tier of crafting (it's been a while, but I think it was every 10 levels) had great gear that was highly sought out. I don't think borrowing a bit of that philosophy would be a bad thing.
Let the slicers keep their credits. It's a cool idea that has a place in the game. It would just be nice for crafters to actually make the sort of gear that would appeal to all these rich slicers at multiple points in the game and not just level 50. Don't nerf slicing, boost crafts =D!