Highly doubtful. Their foiled unholy alliance in the 90's was a result of both of them trying to gain. Sony wanted to enter the market and Nintendo was looking at future options for gaming technology. Course we know how it ended...

I could see a similar blunder happening but like this one, I doubt anyone would realize how big of a deal it would have been til after the fact. Sony and Nintendo have nothing to gain by merging really and their business models are on opposite sides.