Yeah, that's what I'm afraid of too. Since Nintendo is more focused on younger players, unlike Microsoft, they are more cautious. That's why they use numbers as a way to play others online, and make it so that you only play people your "supposed to know". Hopefully they will make some sort of system that will allow you to play against others without knowing their wii number, similar to Xbox once again. Nintendo is probably afraid of the people who will talk "inappropriately". Even if you will need to use wii numbers to play people, you can always use Smashboards as an infinite amount of people to play against. That is soothing to know, and cuts back my fears of online play.