I might agree with you in some points... but where are that huge differences between 2008, 2012, and even 2014 to make an older certification not valueable anymore? does 2014 use neither SQL nor the relational model?

If you are certified in any of the SQL Server versions, you proved your ability to use databases and sql development in a professional manner. The few functions and extras in the newer versions could be learnd in just few weeks (in worst case).

Should everybody studying computer science (or everything else) wait for his degree because the technology is changing? And a degree completed in 2006 is no worthy anymore?