TBH probably not much...Wii is probably powerful enough that it can't be run in an emulator on Switch, it would require a full port job. And if that's the case, they'd probably get more traction out of Mario Galaxy or Skyward Sword HD.
Wii U is probably the place to enshrine your Wii collection. Still hoping NSMB Wii & The Last Story show up at some point.