Well, we have to remember that the PS3 is actually a "cheap" system.
If you go out and build any PC today (let alone a Core i7), you are definitely going to stick more than 256MB worth of ram inside.
If the PS3 was jazzed up a bit, its advantages could shine so much more - stick 2GB of system ram (at least), stick in something newer than an Nvidia 7000 series.
It does show how scalable the system is though, its successor could simply be the same system with a beefier chip (more cores), some additional memory, and a new graphics chipset and it would be set for years to come. The CELL is a powerhouse, I just wish we did not get the short end of the straw back in 2006 - but there is always more to come in the future!