My Antionchian Orhtodox parish has received two large Millenial families (4 children each!)in the past year with another (3 children) soon to follow.
And we are as traditional as it gets:
All male clergy. Liturgy that is chanted by clergy in vestments with incense. No pandering to the LGBT or feminazi agenda. Rigorous fasting for about 1/3 the days of the year.
And the folks are coming in droves. We may soon need a larger building....again.
I think the Latin Mass has it on you there.