Yeah but you could just as easily argue 400k or so people in the uk recently bought spiderman and now some won't buy fifa. Forza is a much smaller release.
People buying games after a three week gap is much more feasible than people buying two games at once. I don't get how this is so hard to understand.
Bet with Intrinsic:
The Switch will outsell 3DS (based on VGchartz numbers), according to me, while Intrinsic thinks the opposite will hold true. One month avatar control for the loser's avatar.