The problem with the Poznan is that we do it when we have scored. When we score, everyone celebrates in the normal fashion: jumping up, hugging your next-door neighbour and shouting etc. Then we watch the replay on the screen. Then we attempt to sit down. Then someone starts doing the Poznan (South or East Stand usually). Most people are a bit bored with it.
Maybe if we did it at other times with a bit of orchestration, rather than after we have scored it might be a bit more popular.
To be honest though, although it looks as if people are losing interest, if we are in a good position at the end of the season, it will make a comeback.