God bless Fr Nichols for taking a stand, but Bergoglio won’t respond and doesn’t care. He’s an egomaniac and dictator. If he hears about this at all, he and his toadies will brush it off as yet another example of inevitable attacks by the Anglo-Saxon capitalist class upon a pope who’s truly on the side of the poor. And, yes, they really think that way.
Don’t be surprised if Bergoglio indirectly refers to the signatories as the Great Accusers (i.e. Satan).