And the selling point for USB 3 is?
And the selling point for USB 3 is? Yet to see any real reason why it's needed now.
Yes, improved data transfer rates... USB 2 is good enough for the majority of user and uses... The average user is used to and doesn't complain too much when waiting a few minutes to transfer the latest and greatest film they downloaded from the Internet from one device to another. Why? Because it's a tangible length - i.e. a 90 minute film and copying it in 5 minutes isn't seen as a chore because it's still much quicker than 90 minutes!
Besides, until devices such as mobile phones and cheap affordable "memory sticks" actually support USB 3 then few people will care.
As for the alternatives - streaming video high speed camera interfaces - exactly how many people have these and Internet links that aren't still considerably slower than the USB link?