I agree that www may become considered needless in coming years, but it helps me separate an actual website from it's supporting resources.
The reason why you wouldn't want to support both is that search engines may index the same page twice, with and without the www, which affects the importance/relevancy of the respective content. For example, a page that provides how-to information may compete with an alternative URL from your site elsewhere in the same search engine. If you force the URL (either way), then it is likely to be indexed with one URL and all of the traffic results go to the single respective URL.
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