Interesting speculation, but this likely isn't what happened.

As others have pointed out, for a MiTM/ddos attack, the ps3 isn't a better target than anything else out there. In fact, given the amount of ps3s, it makes more sense to go after windows update and get what is likely an order of magnitude more infected windows machines.

Even if I had a ps3 (which I don't, while I wanted one about 6 months ago, the geohot incident has dissuaded me from touching new sony equipment), I wouldn't be worried.