No, I'm against this. If I write an answer somewhere, and that Q&A gets bumped, it encourages me to review that answer, to make sure that it doesn't:
- Contain any misinformation I may have provided. This is a rare chance, but if the question has been active, had the answer contained some false information, someone would've pointed me in the comments, but since the question has been getting low views, chances of errors are high.
- Need any new information or perhaps I might've learned something on the go which I might now want to add. We're learning all the time. We learn new things everyday, if I've learned something after the answer was posted, there's a high chance that the answer can be further improved.
As Shog9 has already touched upon this in his post: How can we make the purpose of Community "bumping" more obvious? that Q&A all in all needs feedback. I feel that, that feedback must also come from you.
It also needs attention, less people visiting that post means that there's a high chance of a error creeping in as the post becomes more and more outdated:
- Do the links I've posted still work?
- Are there any recent changes in the documentation of a code that I had then posted needs to be mentioned now? , etc.
Adding a warning that you'd answered this question discourages all of this. Still, open up the answers you've already posted – regardless of whether they're bumped by the community. Think for a while if you can make it better or see if there are any comments to your answer.
Sometimes, I don't reply to comments if I've more pressing things to attend to; and now if I'm coming back to my answer when I've more time to spare and there are unanswered comments, they can now be taken care of. This may seem trivial if the community is small, but in the long run, revisiting old answered questions is always a good thing. Don't worry about wasting a few seconds, you're making StackExchange better every time you fix a thing.