I'm a digital artist and I think this is a bad idea. I mean having a tablet is good, but you can't really release your full potential without a program like photoshop CS4, Flash, CS4, SAI, etc.
Having a tablet cost 60 dollars JUST for the wii is a little too much, since you can get a decent "okay" one for 100 bucks for the computer.
Even if it is "just for fun", it will end up in your junk pile of hardware you never use anymore real quick