Offering Communion Under Both Species has never been required, only for the priest. As far as I know, offering the chalice was never standard until the last few decades. What gets me is that in that time we've also seen a sharp decrease in the number of priests. With offering both species, that means more Eucharistic Ministers are needed, and since they are not available, Extraordinary Ministers of Holy Communion are used. But since EMHC's are only to be used in extreme circumstances that would unduly prolong the Mass, wouldn't it make sense to quit offering the chalice. Not only would it mean less EMHC's and make things quicker, I also think it would clear up some confusion about the Eucharist since some people seem to think that they are being deprived if they do not consume the Precious Blood (not realizing that the full grace is imparted in either species).
So if the Church has declared that EMHC's are only to be used in rare circumstances and in general to be discouraged, why have we seen little action about Communion Under Both Species which would probably cut their number by half?