A more pertinent number to this discussion is titles sold per console. I don't have those data on hand, but last I heard, the PS3 had a miserable stat in that category, as most early units were bought by videophiles as a cheap Blue-Ray DVD player, and weren't really being used as a game console.
By either metric, Sony doesn't dominate the market like they did with the PS2, and this has turned some of the design decisions made years ago into big liabilities.
A method of solution is perfect if we can forsee from the start, and even prove, that following that method we shall attain our aim. -- Leibnitz