Well, if we must have FC's...then I truly hope they will make adding easier and give us plenty of space on our friend list. In MKWii, you are only given 30 spots for your friends. I constantly have to delete people I don't really want to, so that I have space to add.
For 16 player matches, any given clan member is going to need a whole lotta spaces to participate without juggling. And it isn't like there's a space crunch. Those codes don't take up a lot memory.
Still, it's so much easier to find one server than tons of people. Or to deal with having to get everyone into the game in a short time period before it starts without some of them. Hopefully, there's at least some form of lobby included in their tweaks.