Mr. Blair appears to make the same mistake that a great many other people do - that the Catholic Church (or any Biblical church) is free to modify it's beliefs based on popular opinion.  

I'm surprised that at some point in Mr. Blair's new-member classes prior to his conversion, it wasn't mentioned to him that the church (by and large) is not simply making stuff up about how we ought to live.  Is the goal of the Church to reflect the minds and opinions of the average person in the pew?  No!  The goal of the Church is to faithfully testify to the revelation of our creator God as reflected in Scriptures and the life, death, and resurrection of God's incarnate Son, Jesus Christ.  As such, the Church doesn't get to just put things to a vote, or admit that folks are pretty convinced that something the Bible says is wrong is really ok, and therefore we're going to go with the people instead of the Bible.  

The discrepancy that Mr. Blair points out between what the Catholic Church teaches and maintains and what the average Catholic in the pew thinks is a condemnation of the Church's lack of ability to teach and form it's people - a condemnation that many other denominations would also fall under (my own included).  It is not, however, an indication that it's time for the Church to reverse course on the issue of homosexuality, just as it wouldn't be reasonable for the Church to suddenly support stealing, or adultery, or any number of other things that the Bible clearly states are wrong, and that most people still agree are wrong.  

Mr. Blair is certainly not alone in his confusion on this issue - he just happens to be a prominent person who generates publicity and press when he makes comments that many of our own parishioners are making.