Why PageRank updates stopped?
The update was due in the second or third quarter of 2013, but it was not to be, apparently owing to some problem with the PR algorithm. Google's Matt Cutts explained that the 'pipeline' to send PageRank updates to the toolbar is broken, which means that PR will not update automatically.
According to Google, too many people obsess over PageRank, even though it is not 'very important' anymore. Hence, fixing the problem isn't a priority.
The PageRank update in December last year was not entirely intentional. According to Matt Cutts, the "Team was fixing a different back-end service and did a PR update along the way."
Will Google Kill PR?
So what does this mean? Is PageRank doomed, because the data it depicts is now very much out of date? Well, that is not entirely true. PageRank is still relevant.
Bear in mind that the problem was caused by a broken 'pipeline' between PageRank algorithm at the back-end and the toolbar. PageRank is constantly updated for its internal use for ranking pages. It’s just that the outside world doesn’t know about how things have changed in a prompt and consistent manner.
Google obviously thinks that consumers don't need the latest data, because publishers obsess over it too much. So why not pull the meter from the toolbar altogether? Google said that despite everything, consumers still find it useful. Now I'm not sure what exactly do they mean because on the one hand, according to Google, people still need the data. But on the other hand, Google also thinks that people obsess over it too much.
Of course, anyone using the toolbar also sends Google back data about what they’re viewing. So maybe Google keeps the meter going because it wants that viewing data. But even so, they should come clean. Either update it regularly, or remove it altogether!