Lots of people saying "why not release Prime Trilogy now since this quarter is dead?"
1) This quarter isn't dead. 2D Mario, one of Nintendo's best-selling franchises ever, just came out. Yoshi is out in March. Neither of these games are sales slouches. February is dead, but...
2) This quarter is still going to be heavily driven by Smash Bros. and Pokemon, just like how Jan-March last year were driven by Mario Kart, Zelda, and Mario Odyssey. It might make sense to save Metroid Prime for later in the year when the slew of big evergreens start to lose their impact.