At this point it genuinely seems as though doing nothing would be better than using Twitter. It produces a convincing illusion of being entertaining or even useful at times, but for me it truly and wholly lacked any significant utility or fulfilling elements.
Apart from HN, I’m totally off the social media train and fairly content with it being that way.
I suppose PG has more use for social media than I do, so the case may be a little different. Even so, I doubt very much that him returning to Twitter (or anyone for that matter) is inevitable.