First, it will make the Church younger and more masculine. There's nothing the Catholic Church needs more right now than big infusions of energy and testosterone. Young people have always left churches as a part of them finding their own way apart from their families of origin. Having said that, it's pretty hard to bring them back when they're ready if your priests are 60 years old and effeminate.
Second, I don't think the theological arguments are all that strong against it. I've always had the feeling that they're kind of explaining the reasoning after the fact instead of deriving catechism from first principles. If you want a knock-out punch, there's Matthew 8:14-15.
Jesus entered Peter’s house and found Peter’s mother-in-law in bed with a fever. He took her by the hand and the fever left her,If Peter is the rock upon which He built His Church and Peter was married, it seems perfectly fine to allow married priests. On counterpoint, here's the response from Catholic Straight Answers.
Note that the passage does not mention St. Peter’s wife, but only his mother-in-law. The Gospels, however, make no mention of St. Peter’s wife, living or nonliving. Therefore, St. Peter’s wife must have died before Jesus called him to be an apostle.Meh. That's pretty ambiguous data upon which you'd build a crucial point of Catholic doctrine.
For full disclosure, Clement of Alexandria (Stromata, III) (c. 202), said St. Peter was married, had children and witnessed his wife’s martyrdom in Rome. These terse points were recorded, citing Clement, in St. Eusebuis’ The History of the Church. Given the silence of other church fathers about St. Peter’s wife and children (who would have had some prominence in the history of the early church), and the lack of any archaeological evidence of ancient Rome, which holds the burial sites of St. Peter and so many other early martyrs, one would conclude St. Peter’s wife died before he had been called as an apostle.
Heck, if you really want to go all-in, reclassify priests' wives as nuns and ask that they go through formation as well.