This arguement seems very odd to me. Seems alot of people are complaining about having to sync up their controlers betweens each fight. Well, especialy since there isn't any 3rd party wiimotes yet, each console at a tournement should have 2 pre-synced wiimotes. Were would be no problem with this if all remotes are synced properly because of a few reasons.
1) if you choose to use the wiimote, nunchuc, or classic then you could bring your own batteries and switch them into the controller, thus thining the chances of the battery dieing (unless you bring used or undercharged ones but, whos fualt would that be?)
2) if the nunchuc or classic is chosen as your prefered controller, bring your own to hook up to the pre-synced wiimote. If wiimote alone is chosen then, well... there it is? hurray?
3) Befor fights you need to enter your name most of the time and there you can change the controler you would use, both taking less time then trying to sync a new controler each time. And if you feel the need to costumize the inputs then you could always memorise how you like to for quick entry.
4) assuming you are at a large scale tourny, a group of 3-4 consoles could be clumped togather, having multiple 'groups' about 30 feet apart to keep controlers from mixing. Again this is assuming you're at a very large tourny.
5) and in the end if all you are is grossed out by using a controler someone has sweated on and gunked up, bring wet wipes
On a side note if you want to use a gc controler then yes, a wireless may be a bad idea if at a large gathering. If these radio wireless controlers are allowed however and you can't get a WaveBird there are 3rd party alternatives (MadCatz etc), or maybe even ThrustMasters T wireless Classic (
http://gear.ign.com/articles/838/838868p1.html ). But the again, a wired gc might just be easier
EDIT: I know some of my post has been touched on before, so just think of this as a sum of the logical solutions found on this thread