The Church will always have corruption in it, because the Church is made up of sinners.  The fans of modernist architecture are just as much sinners as the fans of more traditional architecture.  

Keep in mind that one thing Jesus never attacked was the Temple.  He never said, that it was money wasted that should have been given to the poor.  In fact, he got angry when people started treating it as a market.  Now lets remember, that in every active Catholic Church, there is a tabernacle that houses the body of Christ.  Jesus lives in many places on the Earth, but make no mistake, he lives in a special and extraordinary way in those Churches.  Shouldn't our first purpose in building a church building be to remind everyone who actually lives there?