It's not rude if it is done with some tact.
That being said isn't the point of this site to have a discussion. Every single question has and answer somewhere. Should we just archieve the entire site and not allow questions becuase they have already been asked?
I think the point is being missed here. I'm not speaking of every question that has ever been ask on RC, I'm speaking of a handful of questions which are ask weekly and sometimes daily. Of course we want to promote discussion and interaction, and that can still take place once the OP does the search or follows the link provided and then comes back with a discussion on the topic and now he/she has a measured understanding of the question originally ask. This in and of itself promotes discussion.
This poll will do wonders as it is getting the word out that the search option does exist.
Mucho Reef