Even if they decide to focus only in titles scheduled to come in 2019, there's a lot of content: Super Mario Maker 2, Fire Emblem Three Houses, Astral Chain, Deamon X Machina, Luigi's Mansion 3, TLOZ: Link's Awakening, Pokemon Sword and Shield, and Animal Crossing. Add in there a couple of 3rd parties ports and we are good.
My guess is, if they decide to show a 2020 title, it would be Bayonetta 3, or delay one of the 2019 titles.
Proud to be the first cool Nintendo fan ever
Number ONE Zelda fan in the Universe
Prediction: No Zelda HD for Wii U, quietly moved to the succesor
Predictions for Nintendo NX and Mobile