Sometimes we don't want such detail visible at all. And this is a concern of mine: will having 'full' DR prevent us from taking shots such as silhouettes which rely on inky shadows for their success? I really don't want the camera seeing scenes as my eyes see them: the 'faults' and limitations of photographic equipment that frustrate so many are the very tools that some others find essential in their image making.
There will be no problem if the sensor initially records data that you don't want in the final image. You can always process it out again. You can't add it into the image if you didn't record it though.
Yes there are features that to me might be more important overall than improved DR, things like native mount lens choice, AF performance, and TTL flash systems all might make it on the list above improved DR, from what Canon offer now. If I can have it too great, you can never record too much information during the initial recording phase of making a photograph. The more information recorded the more options you have. Even if in the end you set some refetence point to use to convert the image into a single bit per pixel for the final output.