Helped Blu-Ray win the format war... had AMAZING High rated exclusives,came out a year after the 360,cost more and still ended up in 2nd place behind the wii. Not 2 shabby I say...
TBF, 360 number reports ceased before PS3's, so we don't have an exact LTD on it. But from where it stands, PS3 only managed a couple extra million more in sales, it's effectively within a margin of error, and that is with considering it was in many more markets than 360 which, by that logic, it should've had an even larger gulf between the two in LTD sales.
Then consider the fact that they still incurred losses for so long because of the high BOMs, saw lower attach rates, and had to spend a lot more in R&D, marketing and (presumed) marketing deals and financially, total PS3 lifetime sales did not overcome the losses incurred. So in that sense, it was still a pyrrhic victory.
Both PS3 and 360 had highly rated exclusives that gen so that's a no-brainer, and Blu-Ray was one of the chief reasons it came out a year behind 360 (Cell being the other). PS3's price was only massively beyond 360's until around 2009, once they did the revision. That's about when, on average, PS3 and 360 were priced similarly on the high-end. 360 had the Arcade edition unit on the low-end but I dunno how popular that maintained given the laughable amount of storage you got on the thing.
Overall yes PS3 did help Blu-Ray out, but I'd say it was nowhere to the level PS2 helped DVD become the mainstream format. I'd also argue as a mainstream format, Blu-Ray has provided less returns for the investment compared to DVD; DVD didn't have to compete with streaming right as it was coming into proliferation.