0.01 USD fee would be normal in my opinion. Lower fees are for everyone, and I would leave option +10$ fees for people who wish to make very high amount of bitcoins very fast, but generally for us normal and ordinary people lower fee is important.
Maybe $.01. Everyday there is a lot of transaction going on so they can still take a huge amount from that. I know there is a few millions of people now using bitcoin. I bet they get much more than they need and there's no need be greedy.
This is how I see this, its better to have 10 or more transactions with 0,01 $ fee, then just one with 1 $ fee. There is no need to be greedy but this world is working on that apparently, looks like its in our veins. And even thou I wish lower fees, I think high fees will win in the end.