A thought I just had: There seems to be a lot of concern on this post as to who will buy this camera. That this camera won't sell well. And my response to this is.... Who cares? I would be totally fine if this camera only sells 1 unit worldwide (and that would be to me of course...). We should really be less concerned with Canon's sales numbers and more concerned with our own creative output.
Well... the simple and obvious answer to your question is that the people who are discussing it care. They may care for their own personal reasons or simply personal interest in such things. If you don't care then the posts don't concern you and you can choose to discuss other matters.
The more in depth reason is that this is a Canon gear site and it's full of people who care about Canon gear and all the intricacies of Canon's gear line up. They are interested in discussing a wide range of topics with like-minded people and value those discussions. Some people here work in the retail photography business and care deeply that Canon introduces products that will sell well and be commercially successful.
For my part, one area of my profession is market and product analysis and forecasting... I look at new products that are pitched to me and assess whether such a product will have mass appeal and be commercially successful. I'm also a camera gear-head so I enjoy these conversations, they are instructive to me. I'm also and investor and make investment decisions based on the direction I think large companies are going and that as well means it's valuable and interesting to dig deep into what drives consumer acceptance of product releases and whether a company like Canon still has it's wits about them or is struggling with product development that will have mass appeal or if they will start to lose market share over a 12-36 month investment horizon.
As Canon customers it's in our interests (to a degree) to hope Canon is commercially successful with their photography gear because it means they will continue to be profitable and develop new and better photography gear for us to buy, use, and talk about with our fellow photographers.
If you don't care about such things, don't respond. If you do respond your input is valued and desired, I would appreciate it and learn from what you have to say. You are one person and in the grand scheme of things your purchase decision doesn't matter and nor does mine. But the overall market forces do matter to product development.