Weren't most major Mario games released early in their respective console's life? If so, it's a no brainer to expect Mario Wonder to have a much stronger opening than most if not all Mario games, especially with the "Switch effect" in mind. Wonder came at a time where other major Nintendo games had insane openings. The game definitely had a meh launch in comparison. It should have strong legs, but Switch 2 may hurt them, and a Wonder DX would pretty much cut them.
It's my first time in a while that I overestimate a Nintendo game. When a company keeps beating your expectations, you're bound to one day overestimate them. Not that it matters... a Wonder DX on Switch 2 releasing early in its lifecycle is guaranteed to have great legs, and combined, Wonder and Wonder DX could well pass 40 or 50 million for all I know.