Calm down, Nintendo bitches... When I say "MK9 will suffer" I was not talking about sells, but about time played by casual gamers.
Horizon 5 is fun as hell, have GREAT soundtrack (not like GT, a boring simulator) and also have real cars, and many times I simply would preffer to play something as Horizon 5 instead of some Mario Kart 9. I KNOW MK9 will sell "BILLIONS AND BILLIONS" in Switch 2, do not worry.
But really, Horizon 5 in Switch 2 would be fantastic. I hope they'll do.