If the Paper Mario rumor is true, I feel like that's pretty big. TTYD was probably the best Nintendo produced story...possibly ever. It had the best humor of any Nintendo game too. If they just give the fans what they want here with a return to TTYD style Paper Mario, I think it could sell systems, and become the best selling Paper Mario to date pretty effortlessly.
I hear a lot of people say the Switch will decline soon because it's out of big guns now that Pokemon has released, but things like this make me think they're wrong. If Nintendo pulls a classic Paper Mario game out of their ass for late summer to fall, and a 2D Metroid (probably Super Metroid remake, lets be real) for fall, then combined with Animal Crossing in early spring, Xenoblade remake in late spring, and perhaps Bayonetta 3 in summer, all they'd need is a holiday release for BotW 2 and they'd have the perfect recipe for an even better year than last year. Especially if the new hardware rumors are true. Then with the new hardware, an exclusive Mario Kart 9, exclusive Metroid Prime 4, and exclusive Odyssey sequel would probably be all it needed to keep that momentum going into 2021 and beyond.