Denver *is* a metropolitan see. Hence "Archbishop Chaput."
While I understand others' admiration for the man, transferring him would force him to take at least a year or two getting used to his new see. And as ordinary of an even larger archdiocese, he'd have even less time on his hands than he does now.
And so he'd make fewer speeches like these.
Several more Denver priests influenced and formed by their archbishop will become bishops themselves. His effect will be felt in other ways, especially with Archbishop of Denver emeritus Cardinal Stafford being at the Vatican.
Also, as a Denverite, I don't want us to lose Archbishop Chaput for many years.