Note that the actual rite presupposes that the bride and groom process in together and are greeted at the entrance of the church together. If you've ever been to a Catholic wedding in a non-Anglo country, that's usually what you'll see.
So, what the Archdiocese of Philadelphia is trying to do is bring the practice of weddings into consistency with the Universal Church.
Admittedly, it would appear that they have done so in a hamfisted and insensitive way. You can't expect people, conditioned by decades of American custom, TV shows and movies, etc., to just accept such a change overnight.