The patient Nintendo gamer has to wait for an emulator and raise the Jolly Roger.
In all seriousness Nintendo games for previous gen (Wii U) are roughly half current gen. In the current gens store. Go back further and they just don’t support it.
The real problem now is all console companies just close the store on their old consoles so physical media is the only purchase route that lasts if you want to stay legal and that has scarcity value in the end.