I wouldn't call that a grey area. I would call that not being prosecuted. While the experience is probably stressful, the reality is that the person is not convicted so there is no lasting impact.Smoked Salmon - Is this in danger of falling into a grey area where people are raked over the coals before the CPS just drops the case?
It's also unlikely that a precedent would have been set had there been a hearing since it would likely only reach precedent stage if there had been a conviction and it was appealed. Public Order Act offenses are nothing new and it may simply have been a conviction at first instance with no further challenges.
I haven't yet read why this was dropped, but I suspect it was because of the difficulty of producing evidence beyond the statements of stewards and/or the officers who issued warnings. If I were fans I would not be cavalier and assume this is a free pass to say what they like at games without fear of action. It's possible that this will be tried again at a later date if the problems in this instance were evidence based and they can be overcome so I think people should keep this in mind when dealing with the police at games.