Catholics have an obligation to support the Church directly:
Can. 222 §1. The Christian faithful are obliged to assist with the needs of the Church so that the Church has what is necessary for divine worship, for the works of the apostolate and of charity, and for the decent support of ministers.
§2. They are also obliged to promote social justice and, mindful of the precept of the Lord, to assist the poor from their own resources.
There is a great deal of latitude in how this is done, but there is also a degree to which it is morally forbidden to “vote with our wallets,” as that blogger is suggesting we do. I don’t know what “who she thinks she is” has to do with it, though. No one, from highest to lowest, has the right to teach Catholics to violate canon law.
This little tidbit is beyond the pale, however:
…you do not believe in the Faith, easy to see because you don’t espouse it…
As for what is emptying the seminaries, I don’t think the evidence is that parents are doing much to encourage their children to consider the priesthood or religious life. It is probably more common that parents are discouraging a son or daughter who is considering giving their life to God alone instead of dedicating themselves to God in a way that will also produce grandchildren who belong to the economic upper or upper-middle class. (I mean that Catholic parents much more reliably pressure their children to pursue a “good paying job” than giving any word that those same children discern a vocation most pleasing to Heaven.)