It's something I've been hoping for a while now, and Nintendo have officially confirmed that Gamecube games are heading to NSO once the Switch launches.
Nintendo have announced that The Legend of Zelda: The Wind Waker, F-Zero GX, and Soul Calibur II will be launching first with other games such
Nintendo has already been selling a small selection of GameCube and Wii games that run emulated on Switch’s processor (Tegra X1) in 1080p.
The Dolphin emulator can be installed on Nvidia Shield (Android) and, thanks to modding, on exploitable Switch systems as well.
However, this newly announced library of GameCube games is only for Switch 2, which has drastically more powerful hardware than the 8-year-old original Switch.