Okay, you guys are practically arguing over two different things. Carroll is obviously coming at this from a filmmaker’s perspective, while Slurping is coming from the photographer’s perspective. For film making, a DSLR can last a lot longer than for photography. To specifically address the 3-5 years argument, Slurping seems to be getting this number from professional photographers, and I'm going to assume he's tell the truth about his sources. If you look at the professional camera market, about every 3-5 years DSLR bodies make a huge leap. The sensor quality is not the only important thing to professional photographers. There's drive speed, processor speed, auto focus speed and accuracy, battery life, and a lot of other stuff. These are details that make a big difference to the working photographer, but not to a mom taking pictures of her kids. These are also things that don't matter to someone primarily using a camera for video. In fact, DSLR video hasn't really improved since the 5D Mark II and the 7D (except the EOS-1Dx C, which I don't think anyone here can afford). If you’re using your camera to film, there's no reason to upgrade as long as it still works; but for photographers, there are a lot of others aspects of a camera body which are improving at a much higher rate than image quality, which are really important. So basically you’re both right. You’re arguing black and white in a very grey field.
This whole argument seems to have started because Carroll belittled the gear of some other members. The camera is not what makes the art, it’s the person behind the camera. The T3 might not be the best thing out there, but that doesn’t mean it isn’t capable of producing good images, I’ve seen it used on a very professional stop motion production. Carroll, the T2i isn’t exactly top notch either, so please don’t scoff at others' cameras. There’s been a lot of negativity in the community recently over some really dumb arguments, and it’s frustrating. Slurping, there is absolutely fashion within photography, far too many people focus on what camera they have instead of what they can do with it. I used to be one of these people, and I’m working very hard to change that. Instead of arguing, go out and make something.