It's not a good idea to stress too much over cuts. Remember that every character will feel and play differently in the new game; your current main might not even suit you well in the new game. Like Brawl G&W is a nearly perfect character for me, but even if G&W returns in smash 4 (I consider it pretty likely but not quite guaranteed), how can I know he won't be changed in ways that make him a worse character for me? Just reverting turtle to that horrible thing it was in Melee alone, even if he was buffed in other ways, would really destroy a lot of what I love in this character. What if he's just horribly bottom tier and not playable in any meaningful way (fitting that Captain Falcon is being discussed here)? I have no way to know any of this. What I do know is that I'm already very interested in the playstyles of two of the newcomers (Mega Man and the Villager) and that even without newcomers I like enough of what encompasses smash character design that I could easily find someone from the cast of Brawl no matter how the field was tweaked.
I'm sure all of you are the same way. If your current favorite gets cut, you'll complain about it for a while, actually pick up the game, and discover someone else that works great for you. Most of you will drop your current main for the new game even if your current main does return anyway; just looking at the icons, I can see how few of you play the same character in Melee and Brawl so why would the new game be different?