Well, I'm pretty sure NSider was already compatible with the Wii browser. I've been able to use another Lithium message board (Adult Swim) on the Wii browser. You couldn't use the WYSIWYG editor, but if all you're doing is entering text (and would you really want to do much more than that without a keyboard) it worked well enough.
I do know Lithium costs a boat-load of cash, so that probably factored into it. Still, they're spending 14 million bucks on sleves for our wii-motes, so who knows what the hell is going on at NOA anymore.