In my opinion I think
Wii Moo Moo Meadows
GBA Mario Circuit
DS Cheep Cheep Beach
N64 Tad's Turnpike
GCN Dry Dry Desert
SNES Donut Plains 3
N64 Royal Raceway
3DS DK Jungle
DS Wario Stadium
GCN Sherbet Land
3DS Music Park
N64 Yoshi Valley
DS Tick-Tock Clock
3DS Pirhana Plant Slide
Wii Grumble Volcano
N64 Rainbow Road
3DS Toad Circuit
N64 Choco Mountain
Wii Coconut Mall
DS Shroom Ridge
GBA Sky Garden
SNES Mario Circuit 3
N64 Kalamari Desert
DS Waluigi Pinball
GBA SNow Land
Wii Mushroom Gorge
GBA Boo Lake
3DS Rock Rock Mountain
Wii Maple Treeway
DS Peach Gardens
3DS Rainbow Road
GBA Riverside Park
Wii DK Summit
DS Mario Circuit
GCN Waluigi Stadium
GCN Daisy Cruiser
Wii Moonview Highway
GBA Sunset Wilds
Wii Koopa Cape
GCN DK Mountain
Wii Daisy Circuit
3DS Rosalina's Ice World
SNES Bowser's Castle 3
and Wii Rainbow Road would be HIGHLY unlikely to return and if it did it would be pointless for Nintendo because the NS2 will be backwards compatible with the NS so you can just play those tracks on the Switch, but what do you think?