I think what he was saying is that Excite Trucks was a failure to capitalize rather than just a failure. I mean it wasn't a niche game as he described it but it came off that way. Although I disagree launch games of a successful console are not guaranteed to be a success (there were close to 30 that launched with Wii so give it a break).
But I would agree that it was a failure to capitalize on a potential mainstream success. I mean aside from Mario Kart, racing games have not been that popular on Wii... for good reason. Excite Truck was not that great of a game. It was more of a game Ninty put out to have something else on the market. Personally I think it would have been a better idea to delay till early next year, give it some marketing, and you could have potentially revived the series from Excitebike and had you a popular brand. Ninty screwed up with that. So when a really excellent game like Excitebots releases, it has nothing to back it up and only the few go and grab it.








