A person is not to receive a blessing in lieu of receiving Holy Communion. The Congregation for Divine Worship and the Discipline of the Sacraments issued five observations on November 22, 2008 that stated why these blessings are not to be done. In fact, the CDWDS cited what is current liturgical law:
As the observations state, everyone will be receiving a blessing at the end of the Holy Sacrifice of the Mass. The time for Holy Communion means just that, receiving Holy Communion, not a blessing. Encouraging people to come up for a blessing just to make the pew departure flow better is not even a good reason. In fact, these individuals should stay in their own pew and pray in their own, quiet manner.
Those who are in a state of mortal sin need to find a priest as soon as possible to go to Confession. They should not be presenting themselves for a blessing in lieu of receiving Holy Communion.
Regarding mortal sin and the blessing of throats, it is not the same as going up to receive Holy Communion in mortal sin.