That's real nice for Rhythm Heaven. Seems that Fire Emblem is poised to do well. That's great, and Nirolak's explanation as to why this sequel is pulling the numbers makes sense.
As for Nintendo franchise rankings, I made this by myself sometime ago. Criteria involves an incredibly complex formula involving sales, popularity, critical reception, gamer cred, mass awareness, recentness, visibility in Smash Bros, and my own buttocks.
S: Mario, Pokemon
A: Zelda, Animal Crossing, Super Smash Bros., Donkey Kong
B: Kirby, Metroid, Yoshi, Wario, Wii, Fire Emblem, Nintendogs, Tomodachi, Splatoon
C: Star Fox, Kid Icarus, Xenoblade, Rhythm Heaven, Touch Generations, Punch Out, Pikmin, Nintendo Land, Style Savvy
D: F-Zero, Mother, Golden Sun, Advance Wars, Game & Watch, Pushmo, Dillon's Rolling Western, Chibi-Robo, Steel Diver, Box Boy, The Wonderful 101, Codename Steam, Art Academy, Rusty's Real Deal Baseball, Fatal Frame, Fossil Fighters
E: Ice Climber, Excitebike, Starfy, Sin & Punishment, Duck Hunt, Custom Robo
F: Gyromite, Urban Champion, For the Frog the Bell Tolls, The Mysterious Murasame Castle, Sheriff, Devil World, Panel de Pon
Obviously this list is mutable, and I'm sure there are several franchises I've forgotten or can be changed. But this is probably a reasonable list of where most of them stand.