It's more of a surprise that you guys used to have 7 that were active; us Taiko people almost always had the bare minimum (not 4 as Loctav thinks but 5 imo, there's an aspect of a BAT mapset for approval getting popped once which require: 1 BAT for the map, 1 BAT for Bub1, 1 to pop it and rebub, 1 to Bub2, and one to rank). It's been the same for us in TWC (we had like zero available as many of the BAT were playing; or Ono as map-sel had to prepare shit so no time to mod and Kana was totally AFK), so for MWC you may expect the same.
Now as people have said, find good candidates; make an internal discussion or whatever so you all agree on who could be one (doing it in #spectator helps a lot as you don't pollute #osumania and spoil everything ever), and send submissions to Loctav or Charles445 or whoever is qualified enough to say if yes or no they're suitable for this position.
I said it in my previous post, people have to be active and regular(I'm watching them...), be clean (No point in giving people BATship if they shit on the CR as Loc said), and get 'noticed'.