I don't know how I'd react to Banjo's trailer.
Despite the overwhelming hype, I didn't really emote that much when they revelead Ridley and K. Rool, but with them I also had this feeling of "well, that was about damn time". For Banjo it's not like that, up until one or two years ago I didn't even think of Banjo getting in Smash as a possibility, he's on a whole other level of unlikelihood.
Plus, there's the fact that Ridley as a character never went on any hiatus, and K. Rool felt like he could be brought back anytime, if Nintendo wished so. While Banjo... is like a childhood freind who left for another country and that you haven't seen or heard of for years and years and years and you thought you'd never see him again. Then he comes back and crashes the family party.
I guess this is just like how Mega Man's fans felt when he was unveiled at Smash 4's initial presentation. Or Simon's fans last summer. Or, in a smaller way, how Pac-man fans (myself included, in fact) felt when in a single trailer Sakurai destroyed the last 3-4 years of that horrible Ghostly Adventures design and gave the real Pac-man back to the world.
If on top of all that he really managed to bring back Banjo, Sakurai is truly the man of miracles.