How would we sabotage the PS2?
The same way we sabotage everything on this website, a series of untimely deaths.
Really though, I don't know. The PS2 did just about everything right and had everything going for them. They started out backwards compatible with the winner of the previous generation and a DVD player. They also got a head start with a release over a year before the gamecube.
There were people who would buy the PS2 just for the DVD player at first, without feeling he need to buy games any time soon.
A lot of people who bought it didn't need to buy new games at first because they could still buy PSX games or use their old ones. This, combined with the one and a half year head start, gave them a near insurmountable advantage in the gaming section. I mean, by the time the Gamecube came out the PS2 had been making games for a year and a half, and still had all of it's hundreds of PS1 games still available. The Gamecube had like ten games out at that point.
If you were to push back the release date to around the Gamecubes and take away backwards compatibility, that could be an equalizer.
The PS2 outsold the Gamecube by something like 150 million to 20 million, it would take an insane amount of mistakes on Sony's part and Nintendo doing everything perfectly for Nintendo to win. Strengthening the N64 and then the Gamecube would probably be more realistic than crippling the PS2 to this extent.