About the monopoly issue, I don't think many people actually want that situation to arise, but it is a fact that the losses by both companies are unsustainable if they continue without borrowing money from unrelated divisions (a luxury Nintendo doesn't have) and they will quit eventually Sega-style if they don't think they'll ever make a profit.
If Nintendo were to suddenly find themselves the sole major company in the console market, there would always be new players: remember, Microsoft and Sony were never in the console market until 2001 and 1994 respectively so there would always be suprise entrants.
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