It will make editing software obsolete if there is no option, so its nice for those who keep the latest editing software, but for those on a budget and still using older software versions, it would not be welcome. I don't care if its added as a option, I just would not use it, space on my hard drives is not a issue.
We may need to find info on how long it takes to compress and save the file to this format in-camera. It may have merit if the time is shorter than the current CR2, i.e. shorter processing time (and obviously smaller file size).