Truthfully, I think Bernhard has just had it.
He's basically given us his entire approach. He has written roughly 4000 posts on everything from the lives of composers, to completely outlining pieces as he would do for his students, to very specific practice methods for very specific passages, going into nauseating detail on how to move to produce a certain sound/play a certain passage, mental play, memorization, Martial Arts and Japanese cooking. He has even given us tens (perhaps hundreds) of book recommendations to further explore the "tip of the iceberg" information he has given us.
He has told us everything he can without us being his students. His students pay a lot of money to get the knowledge that we have gotten completely for free (he says "There are no free lunches;" we've basically gotten a free gourmet meal at his completely selfless expense).
What's more, after the thousands of posts and hundreds of hours spent trying to help us, what do we still get?
"Is Hanon good?"
"You must play technical exercises and scales everyday for an hour to become a concert pianist."
"Is it better to sight read or play by ear?"
Bernhard is not the only one that has given amazing advice (and is no longer around). I do believe that xvimbi and Hmoll also haven't been around in a while. There is a Bernhard index somewhere (I believe Bob and m1469 were working on organizing it all). Any question one has can be answered by looking there.
But of course, people are lazy (and we all know how much Bernhard hates that). They will not search through his posts or buy books. They will ask questions and expect people to give them the answer. What's more, they will expect to just know how to do it by reading the post and thinking about it for a while.
Gee, I'm sounding a little like Bernhard myself, aren't I?

We ask, "Where has Bernhard gone?" I ask you, for what more do we need him?
Of course, let us not forget that he is quite an old man. He may very well just have died.