I'm going with crazy expectations that might never happen:
- New Zelda game. Either top-down Zelda or 3D Zelda with reused assets from BotW and smaller scope.
- Monolith Soft reveals their Action RPG and announces X port.
- Fire Emblem releases in May 2019 and will be huge. HUGE I tell you.
- Persona 5 is happening for Switch.
- Capcom reveals Ace Attorney 7 and MH5 portable.
- Castlevania compilation
- Classic IP's revival: F-Zero, Mother reboot, Custom Robo online, Golden Sun 3
- Switch Lite November 2019. No dock, power efficient chip, undocked performance only. €/$230 comes with MK8DX installed
- Super Switch march 2020. New chip, more power efficient. Performance close to Xbone, better screen but still 720p. Bluetooth, 64GB storage. €/$280
- Super Dock. Optional dock for Super Switch, built in Ethernet port, real usb 3.0, dock gives a modest power boost for framerate/res. Media streaming at 4k, 60fps enabled (twitch, YouTube, Netflix etc)
- Super Mario Odyssey 2 releases same time as Super Switch
- NSO Super NES service launches alongside Super Switch.
- NSO classic games goes to 3 games a week instead of per month.
- (Finally) themes. Either purchase them or unlock them with game purchases. Same with profile icons.
- Message friends directly on switch
- Make groups on Switch. Includes party chat, directly on Switch.
- Folders. They're customizable with....
- Badges! Badge Arcade 2 releases
These are mostly wishes for the Switch itself, which I think 2019 is the time we get (major) improvements on the Switch OS.