This week's book giveaway is in the Agile and Other Processes forum. We're giving away four copies of Real-World Software Development: A Project-Driven Guide to Fundamentals in Java and have Dr. Raoul-Gabriel Urma & Richard Warburton on-line! See this thread for details.
I think what Campbell is saying that while the exam is retired, your cert itself doesn't expire. You will be Java 7 certified forever. There are valid reasons to upgrade like wanting to get an OCP, updating your resume or learning new skills.
Ye,s you should take the 816. The OCA 7 is a valid pre-req for it.