If an athlete starts 40th and jumps 34 spots in 2/31 laps, I wouldn't consider that slowing down.
The ps4 has only been in stock for 2 days. And it is going up against better competition in the month of March (ie the titanfall bundle and titanfall itself) which would naturally cause the Xbox live cards to spike from the boost in hardware sales.
I think we need to wait 1-2 more days and see where the ps4 sits before we can make any judgement. Or wait until there's less than 999 so we can see the pace it's selling.