Are you joking? Taking out the cost of producing and marketing hardware. Nintendo games would sell phenomenally on 360/Ps3. Thats not even considering the money that could be made from XBLA/PSN ports of retro titles.
There is major money to be made there.
I've posted this before but I am going to insist on posting it again in future if people insist on regurgitating the notion of Nintendo going third party...I've included numbers showing the INSANE amount of software that Nintendo have sold on their most recent hardware systems prior to Wii U and 3DS, numbers that illustrate perfectly why people like Bobby Kotick say you should never count Nintendo out.
If you are to realistically imagine Nintendo as a third party, there is just NO WAY that the hypothetical increase in sales of their own software would make up for royalty losses on third party software. NO WAY. As a third party they would have to negotiate paying fees to Microsoft and Sony and suddenly be without hundreds of millions, billions, in income. Why do that?
Your impulse might be to say: third party games don't sell on Nintendo, or that they can't afford a slow start or lower userbase -- but the truth of the matter is they do, and they can. Nintendo alone do not come close to accounting for these software sales.
Even if Nintendo returns to Gamecube or N64 levels, it makes absolutely no sense for them to abandon those software sales and royalties. Those peripheral sales.
And it makes no sense for Nintendo fans to desire they go third party either, as THAT REVENUE is how they can afford to make the games they do, and how they can afford the freedom they have. There are reasons that companies like EA and Activision make very safe games and bet on big blockbusters. They have to. They can only afford the occasional risk each generation because they are not like Nintendo, they don't have this scale of income flexibility.
Look at those Wii and DS software sales. They may no longer be leading the pack, but consider that those platforms are still selling and cannibalising Nintendo's newer hardware, alongside other things like mobiles and tablets. We haven't seen any big first party announcements for the Wii U yet, we don't know the dates or prices for the new Sony and Microsoft consoles, and Wii U is nowhere near a mass market price yet. It doesn't make sense, after four months, to assume that all of that brand appeal and the unprecedented level of software-selling-power has disappeared overnight. Think about what you're doing. You're trying to call time on Nintendo as a manufacturer directly after its most successful ever hardware generation.
There is more potential for crow here than there was with Wii detractors in 2006.