Although the reformed doctrine is true and firm even today, the reformed churches in the Western world seemed to have failed much.
In a way, it hasn't failed. For the parents do care for the well beings of their children.
So that is not the problem. The problem is: there is no power and strength in spreading the Gospel outwardly. Consequently, they suffer implosion.
Putting those "Reformed" titled churches that have actually followed the path of pop churches aside, I would say the greatest problems of today's Western, Reformed churches are loyalists and aristocracy. Perhaps an unavoidable corrupted nature of man from the Jews to the Roman Catholics and to these.