When I asked how Protestant churches handle it, it was basically a rhetorical question.
My point is that nearly every other major organized religion allows their clergy to marry and have families, so it is definitely doable.
And just because their is a huge, arcane hierarchy to support currently in the Catholic church, it doesn't mean it has to stay that way. I don't recall Jesus commanding his apostles to set it up like that. But it probably won't change.
It will change when the priest shortage become so acute that the church becomes nonexistent in some areas.
Probably not in our lifetime, but it will happen.