I guess you are talking about the Irish.
Last I heard in this country the seminaries are overflowing.
USA? No, the diocesan are not overflowing at all. If you heard so, possibly it was an FSSP, or other small religious order, that emphasizes Tradition and Tridentine mass.
They’re doing well... but what you’re not hearing is that it is only a handful of dioceses who are the cause of it: Arlington, Charlotte, Lincoln, Madison to name a few of the powerhouses. FSSP is bursting at the seams also.
The takeaway is this: Orthodoxy and tradition are attractive to young men. Unfortunately, to many bishops this is anathema.