I'm not actively instructing at present, but try to stay up-to-date. I would never be comfortable attaching my professional liability to the training of a sport pilot. No offense, but the training requirements are not offset by the limitations in my opinion. If someone with a sport pilot certificate goes down, the CFI will first one to get a subpoena. It's not worth it to me.
I do hope it works out for those of you trying to make a living as a CFI.