I stand corrected then, I could have sworn they were all released much further apart. I guess thats down to my age related hazy memory
Backwards compatability isn't a deal breaker but the used games market certainly is big enough to require attention still, locking down games is cutting your nose off to spite your face. It's not going to stop piracy.
The only game I've paid full whack for on my PS3 is Gran Tourismo, the rest were all £5-15 2nd hand. I don't know anyone who would pay full whack for the games or not at least wait for the sales - unless it was a one-off must have release - especially when they are generally cheaper on PC if available. Maybe I'm out of touch with the yoof of today and parents with more money than sense though.