What types of websites did those people want? I find that the majority of flash-only websites are those that serve the perpose of just identifying a business or being a protfolio website. It seemed that flash-only websites had faded away but in the past few years they seem to have come back. I don't know why. Maybe it is that the last of the old small businesses are finally getting on the web and they remember seeing some "cool" interactive flash site like 7 years ago, and they want theirs to look like that too.
I truly don't know of any useful flash-only websites that supply a service, such as news, social networking, or e-commerce. Most useful web applications are "Web 2.0" and don't use flash.
I don't think many people are going to browse to the types of sites that tend to be flash-only on their iPhone edge network.
Where it would make a big difference is for people who want to play flash games and watch videos that use a flash player. Many sites have switched to using flash video files to display their video content because the flash-plugin to have a larger install base than windows media player or quicktime. They only have to supply one video format (.flv) as compared to two or three.
And some sites only use flash for their menu navigation on their website, which is just sad and distasteful. I don't feel bad for those websites at all.
But hey, I'm all for adding more stuff to the iPhone. Even if Apple does add a Flash-plugin, I'm sure they will give you an option to disable it. Just like they let you disable javascript. So for those of you who don't care about flash, don't sweat it. I would just turn it on if I was at a website that had a flash video that i wanted to watch. Then I would turn it back off afterwards.