PS3 out sold the Xbox360 in the end mate so that that part of your argument doesn't hold water.
Wasn't having an argument mate, but anyway. PS3 only caught up to X360 at the start of 2013, but it never overtook it. The most accurate figures out there are that the 360 had sold 84 million by June 2014. Sony announced at the end of 2013 that the PS3 had sold 80 million, and in 2014, there were 3.4 million PS3s shipped, so by the end of 2014, PS3 was still 600,000 short of the mid 2014 numbers achieved by the 360.
So in the end they were very close, but in the first half of that gen, PS3 didn't sell too well, thanks largely to it's massive price tag. Neither of them got close to the Wii though, which, despite sales slowing to a crawl toward the end of last gen, had sold over 101 million units. The PS3 started last gen very poorly. In 2010 when GT5 came out, it was the clear number three console in sales, and yet GT5 and GT5P sold a combined 17 million.
When you put that into the perspective of the current gen, where the PS4 has sold over 36 million units to the X1's 16 million, and the Wii U's 13 million, the current console landscape is looking pretty good for any companies making PS4 exclusives. This was my point, that if GT games could do so well last gen where the PS3 was last in sales, then it should be expected to do much better this gen where the PS4 is dominating sales by double it's nearest competitor.