New software comes out on a somewhat regular basis, often solving existing problems in better ways, so I think that this would be a good thing to do, however I see a couple of drawbacks:
Existing answers with high votes will likely make the potentially better software not looked at.
The original poster may not ever come back to comment or compare/test the new suggestion, since once they have a working solution there is a certain aversion to change.
It may be complicated if a newer version of a suggested (in an answer) software comes out, as it would have all of it's (potentially fixed) flaws there, and the votes have been cast (possibly relating to #1).
So I would like to know what is the community opinion on this, and if there is a "limit", what is it? age? once a question has an accepted answer? some combination of the two?