There's no way that Nintendo would push out a new system just for higher margins. They already have the highest margins (by far) of the 3 companies! In fact, their stock is at a record high due to the success of the Wii (coming right after the success of the DS).
Nintendo has never been the first company to push out a new console, and it has always paid off for them (even the Gamecube), so I don't see any reason for the company to radically change its hardware strategy.
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There's no way that Nintendo would push out a new system just for higher margins. They already have the highest margins (by far) of the 3 companies! In fact, their stock is at a record high due to the success of the Wii (coming right after the success of the DS).
Nintendo has never been the first company to push out a new console, and it has always paid off for them (even the Gamecube), so I don't see any reason for the company to radically change its hardware strategy.