Regarding potential improvements to the interface to make it more watchable: some of my thoughts in
this thread. Blizzard's supposedly working something up in-house, but I'm not optimistic.
WSVG and E-Sports in general? Guitar Hero 2 really, really steals the show. Come the semifinals and finals, there's a crowd of several hundred people clapping and cheering and getting into the music. WSVG's treatment of the game, with the stage and the performance criteria (as opposed to just game score) has led to the events really capturing the energy of a concert, which is great. WoW will continue to be a niche thing - nobody but WoW players can understand it - but GH2's simplicity and energy make it extremely accessible for a wider audience.