When this thread was made Sony still had the possibility to make it never happen and allow PS4 to outsell NS lifetime.
But now NS took off at ludicrous speed and at the same time Sony hasn't made yet the price cut PS4 really needed to keep on selling enough, so sales plummeted.
Sony could cut price now, but at this point most probably it could just delay the moment NS will outsell PS4. Unless Ninty stop making it too early, NS should reach PS4 not later than 2024.