This could not be more wrong. I am so tired of people repeating this nonsense.
2006 - CCHA had teams in 3 regionals
2007 - CCHA and Hockey East had teams in 3 regionals
2008 - CCHA had teams in 3 and WCHA had teams in 4 regionals
2009 - CCHA had teams in 4, Hockey East in 3 regionals
2010 - CCHA, WCHA, and Hockey East all had teams in 3 regionals
2011 - CCHA and WCHA had teams in 3 regionals
2012 - CCHA, WCHA, and Hockey East all had teams in 3 regionals
2013 - WCHA had teams in 3 regionals
The NCAA doesn't really care at all what conferences are represented in the tournament especially because it is almost impossible to predict who will advance. They DO care about ticket sales so they will often try to get teams to play close to home as they can but it has nothing to do with trying to avoid a 2005 repeat.