Well it can go down to 0, that is the untimate low. Sony has a big problem. Now compared to the Gamecube Sony has an advantage and a dissadvantage.
1) Sony has a better relationship with 3rd parties going in to this gen, so they may stick it out for longer than they did for the Gamecube. But ultimately money talks and the devs wont put games on PS3 if it isnt selling.
2) Sony has a much weaker 1st/2nd party lineup. Nintendo made the Gamecube profitable just on their own software, Sony cant do that.
The question is how long will it take for Sony to realize that people wont buy 5M PS3s w/o any games... They need a massive price cut now, like $250 and they need some AAA games which they wont have for a while no matter what.
I think the biggest threat to Sony is the 360 though. The Wii will outsell both, but it is the 360 that will kill the PS3. They are basically the same powerwise and MS has them beat on price, games, and cash reserves. Sony may well bow out of this gen. Even while dominating with the PS2 they made little profit.
At some point they have to figure if it is worth it or not to keep a smaller piece of the market.
