There are currently 4,000 priests in Ireland but in 20 years time, with the greying of the clergy and the collapse in vocations, Fr Hoban says Ireland will be "effectively priestless".
In the past 23 years, the number of clerical students has declined from 525 at Maynooth, Cloniffe, Thurles, Kilkennny, Waterford, Wexford, Carlow, Belfast, All Hallows, and Rome to just 70 seminarians at colleges in Maynooth, Belfast, and Rome.
Accusing Church leaders such as Archbishop of Dublin Diarmuid Martin of being in denial, he warns "we have a decade to come to terms with this crisis".
In Nov 2012, Archbishop Martin said that "for the moment what we have to do is find worthy candidates who able to live as celibate priests... I believe that there are candidates there".
Asking questions about the effect of celibacy on vocations, Fr Hoban says too many priests feel disconnected, lonely, and isolated.