The press conference and Free Case Program was only meant to appease the mainstream media, who jumped all over the 'Antennagate' issue and those who had already/were just about to purchase an iPhone 4.
Apple provided every avenue to those folks - full refund, free case, etc, so if you were unhappy, you had a get-out option.
I've had an iPhone 4 for just over a month and I know 5 friends who have one also. Yes, the is a slight attenuation thing going on, but it's never become an issue for any of us - we've never dropped calls or lost data service.
To be honest, even the tech media have moved on, because it really isn't an issue.
It became one, purely because it was Apple's latest and greatest thing. If it was a generic HTC, LG, Samsung, etc that had the idea first, you'd hear nothing about it(well maybe a single post on Engadget, but that's it).