If the initial code had been properly optimized then starting difficulty could have been nearly 9 and we wouldn't be seeing such a short block time. This is a lesson, if your going to release a new algorithm for CPU mining, optimize the CPU code or else you've get quasi-ASIC like behavior in which hash rates explode and the coins may end up monopolized by people who have access to the high potency mining ability even if this is by software rather then hardware.
Starting difficulty would have still been where Sunny set it, 7. I don't know what the distribution looks like, but I am still finding blocks on 5 micro instances and a laptop running while I am sleeping. If difficulty adjustments took two weeks, I would agree with you, but it's dynamic.
If his starting difficulty was in any way chosen to reflect the mining rate of some target number of PCs (the method Satoshi used) then optimized code would certainly have lead him to choose a higher difficulty, do you think 7 was just a number he pulled out of his ass with no regard to the target block time?
