Obviously making profit is one of the most important goals, but looking at the Wii U and Vita, even if they were profitable, they pretty much irrelevant this generation. It doesn't mean they don't have great games, but from a sales standpoint they're both afterthoughts.

For me personally 40 million would be considered "good".

I would say it depends more on profit rather then numbers. If a console sells 20 million units and was profitable for the company then that would be fine would it not? Sure that's a low number but combine console profit and software sales then it's a win win for the company.

From a gamer stand point i guess a number would be better so if i had to throw a number out there i'd go with at least the N64 sales (32 to 33 million). If a console makes it past the N64 in sales i'd say it was an hit.