PS4 Is 'Not A Successor' To PS3 But 'An Addition To The Family'

[platformmaster918]

"While most gamers will be casting aside or trading in their PS3s when the PS4 does launch at the end of this year,"

Wouldn't PS4 have to sell like 40m by the end of the year for that to be true (aka "most" of the PS3 install base)?