I think a lot of commentators miss the point by talking about allowing women and married men to become priests (which I support).  The issue is enormous attrition.  For every one new Roman Catholic, three are walking away.  Obviously, the current model is unsustainable as evidenced by this enormous attrition.  Any able business person would readily understand that there isn't a supply problem (more priests), there is a demand problem (more members).  Fix the product!