I'm going to buy a Wii for sure, and I'm considering buying a 360 together with it (but I probably won't, since I've always been a PC guy). A PS3 is more or less out of the question for me now, since its exclusive games are either not attractive for me, or have good counterparts in the other consoles - the only one which could attract me is MGS4, but I'm not so interested in that series...
I'm not interested in Blu-Ray, since it's not definitive that it will win the format war, and I don't want to end up with a useless HD optical disc player. So if I buy a PS3, it will either be to play with the Cell (I'm a programmer), or when it's $300 at most, and with the condition that I'm interested in the Blu-Ray player. It's not likely that I will do so anyway.
Regarding your last paragraph... Sony is a business, they aren't doing this as a charity! They have a good brand (Playstation means games for many people), and they're trying to save that brand after their many mistakes, the first of which was to produce such an expensive console, and the second of which was to delay it so much! Delays caused lower customer acceptance, less time to reduce manufacturing costs, etc... As long as Sony's games division gets the money to continue driving the PS3, they will do so! The question is if Sony as a company is interested enough in the Playstation brand to drive the PS3, knowing that it will cost them dearly in terms of money.