Depends on what the prophecy is for Jan, and if people pay attention and try and change circumstances to prevent it occurring.
Take St. Malachy's prediction re the 112th (current) pope. Though there were 2 Peter's in the running now, there was no way the vatican was going to allow a 'Peter the Roman' in the big chair as 112th pope if that was the signal for the destruction of Rome and beginning of the apocalypse!
That dosen't make St. Malachy mad for the prediction...
Myself, I used to regularly have premonitions (still do now and again), so don't scoff at anyone who has or has had them. I've been to able to use mine for good, and warn others involved if it was something bad. I figure that was the reason for my receiving those ones.
Thankfully most are just sort of personal indicators of future situations and places I'll be in, depending on what course of action I or others take. (Saw the stages of collapse of the last 2 companies I worked for years before the events for example)
Another point: sometimes people take the written premonitions too literally, or meanings get lost in the translation. Many are 'symbolic'(including many of my own) and though they may sound ridiculous to read, are clear as a bell to those familiar with the meanings.
A good example of this was when a friend in Austria dreamt 2 nights in a row that she saw her mother standing with only one leg, and asked me what it meant. I said 'Sie hat ihre zweite bein verloren' ('she lost her second leg'), a german expression meaning someone has lost a key means of support. I told her that, but also that she still has another means of support available to her (the other leg), so she will be okay. Next time I saw her, she said her stepfather had died soon after, and that her mother had gone back to her father...