Lol, yeah, we're thinking this is at least 3 years off since we want to make sure we plan it out carefully and aren't in school so we can devote all our time to it.
We already were planning on having TVs showing Iron Chef and japanese game shows, but we're hoping that we can play anime as well, we just need to look into the legal aspect of that. We'd need permission from the anime companies to show the licensed animes in public, and I don't know if that costs money. We could possibly show unlicensed, but once again, I need to check the legality of that.
From my experience, cosplay is both something that weirds non-anime people out as well as draws them in. As long as we have a policy that enforces a PG costume rating, then I think it will draw non-anime people in to see all the outfits. In a themed restaurant setting, non-anime people tend to tolerate more out of the norm things because it's part of the setting. Since we're looking at having american, asian, and now mongolian types of food on the menu, we're hoping the food variety and quality will be good enough to draw in non-otakus.
As far as the gaming suggestions, we are planning on having a gaming room with DDR (complete with monthly DDR tournaments ^_~ ) and anime-style fighting arcade games, but we don't want to get as far ahead of us as to have a full out gaming center. Just the restaurant will be enough to start with, and then an added on anime store if we get popular enough.