Post Modernism
In both a narrow and a broader context, he's invariably attacking what stems from religious morality, and if you look at his life and times, there are reasons for this, though they're not necessarily "reasonable" reasons.
He also attacks the results, both in his time and in the future he imagines, of the removal of subjective morality. Anyone who takes from his writing that they should follow suit or live by any code or invent any philosophy based on the emptiness of morality he describes he actually condemns them to the nihilism he sees burgeoning in his time--within that same writing.
I haven't read enough Schopenhauer to comment on his interpretation of the man's work, but I do know that in Nietzsche's time, numerous philosophers were misinterpreting each other's work, and he noted instances of this about his own work. The same misinterpretations are happening to this day, so it seems.
Post-modernism as I understand the movement, maybe not well enough, is pushing its philosophy in precisely such a direction as Nietzsche condemned as a phase of vapidity and ignorance before philosophy would perhaps gradually get back on track.
To predict something is not the same as to encourage it, especially when it's being openly discouraged I would say. To take everything a philosopher despises about a potential future and become it is not to be influenced by that philosopher--it is to be in opposition to that philosopher.
And so they willfully embrace their ignorance while impressing it on young minds under the thin veil of "higher education".