Well, PS3 was not responsible for the wide adoption of Blu-Ray. The studios were.
If the PS3 had been an all out slam dunk like the PS2, Toshiba wouldn't have given up, they would've lost. As it stands, the PS3 isn't really even outselling the PS2 by that much.
I'm not sure. There aren't that many Bluray drives out there. So of the few that exist I'm pretty sure a good percentage are PS3's. Even if Bluray had a slight edge of HD-DVD because of PS3's (it's obviously not a huge edge) this would lead to more rentals (and Blockbuster dropped support for HD-DVD from stores after running a pilot and finding out Bluray was renting 3 to 1).
Since Blockbuster isn't renting HD-DVD and Walmart stopped selling them, studios are being forced to release on Bluray which means people have access to more titles, which in turn makes Bluray players more valuable.
This snowball effect is slowly (for now) killing the HD-DVD industry.
If the PS3 had been an all out slam dunk like the PS2, Toshiba wouldn't have given up, they would've lost. As it stands, the PS3 isn't really even outselling the PS2 by that much.