As to Satoshi's minting design I think it's good enough as he had a lot more important things to deal with. Two things are crucial to his mint design:
1) Money supply is capped/fixed so people can have confidence with the first crypto-currency.
2) Early adopters are rewarded nicely so Bitcoin gets started.
So Bitcoin got started successfully I'd say he accomplished all he needed to with the mint design. Maybe not perfect who knows, but already a job well done to me.
Folks should give more credit to Satoshi what he did is a monumental task. I wrestled with bitcoin design and code in order to create ppcoin, so I understand how hard it was to create Bitcoin. Satoshi is like the Einstein of crypto-currency, we should all thank him for bringing the gift of cryptocurrency to humanity.
Einstein was maybe more gifted in I find his ideas beautifully insightful but Satoshi's invention is revolutionary, it will save the world.
Re point 2. 50% of coins are mined, and 99% of early adopters haven't even heard of Bitcoin yet. This thing needs to scale and a few thousand people owning half the money in the world is going to severely hamper growth. I love the gold analogy, I wish Bitcoin would have followed it more actualy. Gold was not mined in abundance in the prehistoric times it came in slowly and will go out slowly.
The minting rate proposed above, would take a few years to generate any volume. But by the time Bitcoin sees growing pains the masses will still be encouraged to get involved in the system.
As discussed elsewhere I see a problem with deflation affecting adoption.