I don't think we're witnessing the end of Sony, but we are certainly witnessing the end of their online ventures.
What is very interesting is that all of their Web properties seem so stove-piped. No common architectural direction, no standards, no common security defenses.
It's almost as if Sony's marketing departments are leading all Web development efforts for the company. No serious enterprise ever lets that happen.
Oh, wait... :) (Tongue in cheek)