Yeah, I didn't care about Mega Man at all, but I was still happy for his fans. I knew about his history with Nintendo and I even played some of his games to see what he was all about. I was really excited for Pac-Man though, but not for his history with Nintendo.
That's where most people lose focus, third parties should be focused on for their overall history within the game industry, not because "most of their games are on Nintendo consoles." If you remember, Sakurai's criteria was "at least one game."
Not ten games, not thirty, not all of their games, at least one. Sakurai doesn't care about their history with Nintendo.
I still hope for the day that we can see Pac-Man, Snake, Mega Man, Sonic, and Rayman all together in Smash.