For starters I reckon as GT fans we may be biased in our analysis of this news. Our series is incredibly important to us, but doesn't exactly define the PlayStation experience.
http://www.vgchartz.com/platform/3/playstation-3/ In other words I don't think GT6 is as important a system seller as we'd like to think.
Secondly what I got from PlayStation Meeting 2013 is that the PS4 isn't necessarily a replacement the PS3 - but rather an addition to the PlayStation Ecosystem. Not unlike Apple technologies. Quoted from the link provided by diegorborges earlier, Jack Tretton had this to say:
"You know, something that we have subscribed to since PlayStation 1 is that consumers come into the market at different price points, at different times, for different reasons. PlayStation 3 is gonna live on, and we dont expect everybody to drop their PlayStation 3 and immediately buy a PlayStation 4 this Christmas. We know that there are gonna be people buying and playing PlayStation 3 for years to come, just as they did with PlayStation 2, just as they did with PlayStation 1. There may be a consumer that doesnt become a PlayStation 4 consumer for five years. Thats okay. I mean, were selling PlayStation 3s to people today, we sold them to people in 2006, and we hope to be selling them to people in 2015. Thats okay."
Before this post becomes too long, two questions for the unbelievers..
- Why would Sony have two first party car games competing for the same dime at launch?
- Why would the performance improvements in GTAcademy (leaderboards, interface, loading times) not be able to be incorporated into a radically better GT6 for PS3?