The four cardinals are right on the question but wrong on the meta-question.

They very correctly observe that the nod-wink-inner-forum method of allowing the remarried/unannuled to receive communion is logically incompatible with magisterial teaching. And it's incompatible with some really important, central teaching that can't be swept discretely out the backdoor when nobody's looking.

But the meta-question is, should the Catholic Church still believe that doctrine must be logically coherent? And it seems the Pope Francis answer to that is: No, to heck with logic, to heck with intellectuality, the global Church doesn't care for that tired old Western stuff, this is the new Church of emoting and hugging and off-the-cuff preaching and beach balls on the altar and universal concelebration, hooray, let's make a big mess! 

I sympathize with the Four (especially with Meisner, who is a very good man) but they just don't get it and they don't get that they don't get it.