There may be some motivations on editing a question:
- Correct typos / grammar
- Provide a better answer (semantic change)
- Bump the question up, so one can get more upvotes
That being, after I do 5 edits; if I care about reputation (which I do, though not THAT much), and I see a typo, or come up with an idea to improve my answer, I have a conflict: Should I give up earning rep for my answer (which took me some effort to write with quality) in order to improve it, or just leave it as is, so I can still get some reward from my effort? (not to mention that I have no warning about it becoming CW)
But just because of the possibility of the 3rd motivation to editing (at least that's what the answers to this question suggest), after 5 owner's edits, the answer is automatically turned to CW.
In fact, the CW solution doesn't really work, once there are other alternatives to bump questions up
So, I'd suggest that, instead of making the answer CW, we simply remove the 3rd motivation: edits would no longer bump the question to the active list (except for the first 5 ones, which we have by default).
Alternatively (worse in my opinion), we should have at least some warning that the extra edit will change the answer to CW...