Nope, it’ll never happen. The church is just going to have to grit its teeth and deal with it, and come to terms with the fact that it isn’t just the Royals that don’t have the same powers as they used to any more…..
The church has asked the king to step in and block the law that will allow gay couples to marry in Spain. Surely the church should realise that Royalty just doesn’t work like that anymore. They sign these things just for form. Imagine, however, that the King did refuse to sign the new law? What then?