Even as Sony's CEO Kazuo Hirai has done a remarkable job over the past five years -- taking bold decisions on the areas the company should be focusing on, and cutting efforts on those that aren't working -- his company desperately needs a fresh hit to boost its revenue and to become relevant in the mind of most, writes columnist Tim Culpan for Bloomberg. An except from his article: According to a company statement Tuesday for investors' day, the key will be to "remain the 'last one inch' that delivers a sense of 'wow' to customers," expand recurring revenue, and pursue new businesses.Those three strategies are closely linked. With TV sales in decline, its Vaio PC business spun off, and its smartphones barely a blip on the radar, Sony's last inch is heavily dependent on the PlayStation. Sony's Game & Network Services business has grown at both the top and bottom lines over the past five years, but the games console business is stuck in time. [...] Sony needs to build a device that will be far more ubiquitous and can appeal to consumers beyond the current male-skewed slowly aging hard-core gamer base. Amazon and Alphabet, with Echo and Home, are two such examples, and Apple will probably follow suit. With its background in audio, video, sensors and entertainment, Sony has all the right parts to make it happen. For the company that invented the Walkman, dreaming up another hit shouldn't be so hard.