Weren't Monopoly, Trivial, Pictionary, Scrabble and all those board games already 'multimodal, multitouch games'? Will fanning yourself with an iPod feel so good as doing it with Monopoly's fake bills, when you win? :)
Anyway, multitouch tables will for sure be used as what we know today as board games (among many other uses). I'm not sure if they will replace them, but at least they will offer new ludic experiences. And I can easily imagine my living room table being a multitouch table where I can read, play games and control my electronic devices.