One of the things that just doesn't make sense is the idea that an - actually rather arbitrary - national grouping of bishops can announce new "rules" about the Holy Eucharist. The Church's teaching on the Eucharist isn't essentially about rules but about the nature and essence of the Sacrament. National boundaries don't apply here. In the British Isles we have three national conferences of Bishops. It is a matter of national feeling and the convenience of administrative decision-making...and from the Church's point of view that has nothing to do with deciding doctrine.
And the discussion that is taking place about the Eucharist and Matrimony is most definitely about doctrine. It's not about "rules" in the sense that rules are generally understood., eg the rules of a cricket club or ice-skating championship. The link between the Eucharist and faithfulness to God's commandments is central to Catholic doctrine. It can't be regarded as an administrative matter that operates under one set of "rules" in Glasgow and another in Newcastle.
Cardinal Kasper seems to be the person chiefly promoting the idea that local bishops can, in effect, make decisions on doctrine, based on national boundaries. But God's message is the same in Nairobi and in Wimbledon, in Chicago and Buenos Aires and Calcutta and Frankfurt and the Isle of Wight. His Church is a Catholic Church. Local variations in liturgy, hymnology,custons, traditions, architecture make up a rich Christian culture and are to be cherished. Doctrine has no variations and is the truth at the core - literally the heart - of all.