Council of Trent, Session 21:
ON COMMUNION UNDER BOTH SPECIES, AND ON THE COMMUNION OF INFANTS
CANON I.–If any one saith, that, by the precept of God, or, by necessity of salvation, all and each of the faithful of Christ ought to receive both species of the most holy sacrament not consecrating; let him be anathema.
CANON II.–if any one saith, that the holy Catholic Church was not induced, by just causes and reasons, to communicate, under the species of bread only, laymen, and also clerics when not consecrating; let him be be anathema.
CANON III.–If any one denieth, that Christ whole and entire -the fountain and author of all graces–is received under the one species of bread; because that-as some falsely assert–He is not received, according to the institution of Christ himself, under both species; let him be anathema.
CANON IV.–If any one saith, that the communion of the Eucharist is necessary for little children, before they have arrived at years of discretion; let him be anathema.
So here we see the Council stating that it is wrong to believe or to state that receiving one species only is wrong is anathema. And that is reasonable.
But still, that doesn’t mean that the Church *ought *to distribute only one species: drink of it, all of you, He said of the wine.
I think they ought to move to mandate the practice of intinction so all can receive the Precious Blood under the form of wine as well. The GIRM already allows for intinction.
(see 245 of the GIRM)
Those who can’t for whatever reason could simply quickly inform the eucharistic minister, though I imagine it would rarely happen.