It's hardly news that the share of duplicates is going up.
As the sites accumulate more information and more participants, the effort required to confirm that something hasn't already been answered increases at the same pace.
Currently they are simply closed if discovered by the small fraction of users (2%) having a "Vote to Close" privilege but it doesn't happen very often since finding of duplicates is not rewarded.
Although some users discourage referral answers, I don't mind upvoting those which point to a question with better insight - it gives the most useful duplicate a chance to bubble up. To me it seems like a good idea but what does the community think? Are there any drawbacks to it?