Let's be honest... sales may be strong right now, but the PS2 is on its way out, because, as I see it, it will soon lose both key markets.
Hardcore gamers? Well, they're smart enough to know that first-party development has effectively stopped and have moved on to a next-gen console.
Casual gamers? They now look to Wii for a fun experience.
It's not happening right now, but this Christmas, the focus will truly shift to the next-gen consoles. So, no, this won't kill the Wii. Or anything else for that matter.