Is the rumored software backward compatibility real?

[Dogs Rule]

sieanr said:
A bigger question is wether or not Sony has enough motivation to create BC. Thats the real challenge.

Why would they not? Assuming they use the cell architecture on future models (which would be logical since the development hurdles will have been overcome) , then the software bc would be easily ported to future consoles making it a great long-term investment in customer satisfaction. Plus it ensures that they can sell downloadable games via PSN when they eventually switch to a disk less console.