Sony is a company going through major changes - it recently announced plans to lay off 10,000 plus of its workers (some of those through buyouts), has instated a new CEO, and just had one of its worst fiscal years ever. It also recently ended its Android smartphone partnership with Ericsson, and plans to now produce handsets under its own name. It's a difficult and uncertain time for Sony, and the Walkman Z, unfortunately, seems to be an excellent microcosm of the company's larger problems.
There comes an end to the life of every great consumer electronic. The portable CD player.