Sticks? How wude.
It's more about how long they will wear the cost of supporting a platform with possibly declining numbers rather than any problem with the players.
On the other side of the coin, a free upgrade to the PS4 version is all well and good - but does it come with a free upgrade of the hardware? Not a lot of people I know have made the move to the PS4 as yet given that the 'next gen' consoles are still early days with a bit of a dearth of titles.