Yeah, Chrom was easily the most boring of the 'leaked' and frequently requested characters. Robin was inspired.
What characters would even be in the next Smash game after this to generate hype? I feel like you can only go down from Pac Man, Mega Man and Miis. After this, additions to the roster would start to feel like scraping the bottom of the barrel aside from maybe 3-4 characters. Assuming they aren't already in this game, Ridley, King K Rool and Mewtwo would be the only big ones I can think of.
Don't forget the next game will be 6-ish years down the line - new IP could surface, or dormant / fading properties could have a resurgence as with Fire Emblem or Punch-Out. Ridley, Dixie and the Inklings seem likely, but depending on their future roles, Takamaru, Captain Toad, Impa, Chibi-Robo, Sukapon and such might show up. And that's discounting series with minimal representation - I doubt Pikmin will have a solitary rep in the next game, for example.