If the Wii U sold 13 million units, there's 8 billion people in the world and 8.000.000.000 - 7.987.000.000 = 13.000.000, then the Wii U was a success. (That sounded funnier on my head, sorry.)
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So if the wii u had sold 1 unit there's 8 billion people in the world 8,000,000,000 - 7,999,999,999 = 1 that would still make the Wii U a success?
YES.
LOGIC RULES SUPREME!!!
in that case, the ps2 was literally everything