I would stick to PS3 gaming for as long as possible and eventually upgrade my PC. If I feel Nintendo would make an improved Mario64 sequel I would buy a Nintendo (may buy a Wii anyhow in the upcoming months), if I see good evidence that a new Microsoft console is rock solid and well specced for the long run and they make some Playstation-like adjustments I would consider buying a Microsoft console again (but unlikely).
Would be very dissapointing though and luckily I don't see a chance of this happening. The PS3 has started to earn Sony money.