Typically, a church would have either one priest or a priest and a deacon. But that is not the issue. If the priest (and the deacon) alone cannot distribute Communion in the reasonably timely fashion, he can appoint extraordinary ministers of the Holy Communion. There is no objection against that. The abuse is when EMHC are treated as pseudo-priests and priestesses doing an honorary function to which they are entitled, no matter how necessary their service is practically speaking.
LOL!
I think we've all attended the Mass where there was a deacon, a priest, 6 EMHCs and 50 Massgoers.
It's so ridiculous.