Sad to see them go - photography's such a great hobby and having competition in the space is healthy. There's a few brands out there still, but there is a noticable stigma in the professional community around equipment that isn't Canon. If you're not using L-glass, it feels like you get the same kind of judgement that Android users experience when they show up with green texts in iMessage. As a matter of principle, I…
There's a good reason for it -- they appear to make the very best sensors (edit: in terms of dynamic range and noise) in the commercial-camera market. Canon makes their own sensors, which are good in absolute but not relative terms, which appears to hold them back in performance. I don't know if it is patent-related or process-related.
While I use Canon imaging systems, I don't see the choice to use other brands as better or worse. Each manufacturer's line has strengths and weaknesses; you pick the best tool for the job. Essentially every camera and optical system on the market, in absolute terms, is a wonderful instrument for imaging.
This reality is intensely freeing -- it means you can focus more on the image and less on the instrumentation. "f/8 and be there" is still wonderful advice.