Could be a lesson about all those things, or it could just be a lesson that when you base a video game off one of the most popular cartoon characters and most well known IPs of all time it's likely to do well unless you totally fuck it up, which isn't really a lesson.
I understand what you're saying, but if a licensed game sucks, it still won't sell. The ones that have decent sales are the ones that are decent games, like the Simpsons Game, the Lord of the Rings games, Goldeneye (the new one and the original). The ones that well and truly suck, or are just 'ok' don't sell as well, such as Blood Stone.
Epic Mickey is certainly helped by the second letter of its name, but it is also selling well because it has two things: advertising and quality.
Well yeah if a licensed game sucks it won't do well, that's the "don't totally fuck it up" part. Advertising and Quality are helping it to achieve the impressive sales it's getting, but talking as though every Wii Third Party game could be a success if only it had advertising and was quality like Epic Mickey is silly because it ignores a huge reason that Epic Mickey is selling which is the brand name.