Don't switch either yet. Drums got nerfed in the last patch and most of the good LW mail pieces are BoE (or have highly expensive/tough-to-get recipes), and the BS weapons will cost you thousands of gold and as at best side-grades (and at worst, inferior) to the easy-to-get PvP weapons.
I'd keep both gathering professions until WotLK, when you'll know:
A) What final-tier items there are available, and
B) How much the components cost/how hard they are to get.
Right now PvP gear is fine for weapons (and somewhat for armor, though realistically with the raid boss nerfs with 3.0.2, raiding is easy and should be done pre-expansion). In the expansion, you need personal ratings to get PvP epics, so then crafted items might be a better idea for people who bite at PvP (myself included).
For now, don't change.