I can understand both sides of the argument.
I did jump at least one version in the past, keeping my upgrade budget low and have more investment in hardware.
However I can see that it is ridiculous that I can buy a new very old stock clearance PS 6.0 version for 10$ and then expect to upgrade to CS6.
I think if Adobe fully implements its intended policy they will loose customers and revenue instead of gaining revenue. A policy that allows updates for the last two versions would probably be a fair compromise.