Let's not have the developers will abandon PS3 stuff again - it's very unlikely at this point.
Look at combined RE5 sales or any of the big selling AAA titles over last 12 months. Given the cost of HD title development, most developers need to support both - the risks of being exclusive to either console are to great.
What we will see, particularly because of the recession, is more titles looking weaker on PS3 from smaller developers, or some developers only delivering a 360/PC version due to cost issues. We've seen this with titles like Velvet Assassin, etc.
But in the case of the above, for the most part you're talking about smaller, niche titles that will probably deliver weak sales anyway.
Both consoles will have exclusives, but for any independent developer/publisher with the current sales levels and attach rates abandoning any HD console is out of the question IMHO.
Try to be reasonable... its easier than you think...
