thats like saying the ps4 will be much more powerful than the ps3... it's expected of it. ps3 and xbox360 are over 5 years old.
regardless, i can still see my ps3 lasting me at least 3 more years of new game releases and like 4 years worth of gaming goodness so i wont upgrade for next gen before 3/4 years unless there's a must have game that i cant get on my current system.