The Road to 160m+ for Nintendo Switch

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Under 155m is very unlikely.
Nintendo know more about the Switch's momentum and sales than any of us, and they're projecting it will be at just below 155m by the end of next March, just 9 months from now.
Even if they fall short of their forecast by say, 1.5m, that still gets them to over 153m; from there it's less than 7m to break the 160m barrier.