From previous conversations, August, I think you are trying to find a reason not to purchase, at least not right now. The best reason though is that it is expensive.
I have owned just about every model of PC chipset available in the last 25 years and it can be frustrating knowing that on launch day the next generation has been in the design phase for months if not longer but that is how progressive tech works. When the 4 comes out you will be right back here worried about what the 5 will be like.
The real thing to worry about with new tech is how long do you have before it is more or less obsolete by mainstream standards. When will 35 percent or more of the apps start running to slow on the first gen to be acceptable? 3 more years, 4 more years, longer? Right now we don't know and only time will tell. Anyone buying one is either hoping for it to be a nice long time or is comfortable upgrading. You are not the latter so the real question is can you take a leap of faith? Only you can decide.
I didn't buy a 3 because of the new features, which are really nice, I bought it to upgrade my first gen. My wife and I decided to own 2 iPads and after buying a 2 I knew I could not be happy with how heavy the first gen was anymore.
I think the 3 is the plateau for now. They will introduce newer models but I think the changes will be less significant or have a less universal appeal for a few years. For instance they may improve the gaming experience but my favorite games are pretty simple so that would not really speak to me.