Reading this thread's last couple of pages makes me wonder if perhaps you could do with finding greater meaning elsewhere in your life, rather than badgering someone to confess that you, oh wise one, were right all along.
Mrazek has shown that he has great natural talent. He has also shown that lacks the positional fundamentals to maximise that talent consistently. The latter should be considerably easier to acquire than the former, but alas he is now further from doing so than he was when he first broke into the league. This suggests greater mental fragility than he demonstrated through his junior and earlier professional career.
Can he fix it? Who knows? At this stage there are still a whole load of possibilities from finding himself back in eastern europe for the remainder of his career, to turning it around and becoming a good starting NHL goaltender. Very few goaltenders have become what they will be at his age, and that includes those who start great and tail off, and those who suddenly find consistency.
None of us know the guy personally, so can't comment on whether he has the mental strength, flexibility, humility and intelligence to become the player he once looked very likely to be.
And now he's not a wing any longer, very few of us care.