How? Elaborate. First of all, no NA team good enough to go to finals. Hate the crowd as much as you want, they are the reasons it was fun. Will those guys cheer, cry and scream when LOUD plays FNATIC in champs (just hypothesizing)? Just like Tarik said, home-crowd advantage exists. And when the team that gets booed wins it makes their win so much better. Will the fans cry? That is also one of the things that made it better.
Even if seats are filled in the finals, a lot of things will be missing.