New years often bring the desire to launch "new and improved" web-sites. In his article, "Why Most Website Redesigns Have a Half-Life" Mike Volpe, VP of inbound marketing at HubSpot, explains why it may not always be in a company's best interest.
The article points out that frequent redesigns can work against you both in regards to search engine optimization and usability. Mike points out that refreshing a site and making sure content is relevant is important, and not the same as a complete redesign.
Ultimately, it's important to maintain your web-site, just be sure to keep your prospects and customers in mind and temper the desire for new and different for the need for content and usability.