Not sure it's one major factor as a few small ones that are slowly accumulating
Firstly, it means at least one extra day off work, which unlike the Watford game in December, has come as a complete surprise.
Secondly, after 30 years of pining for Wembley, it's simply become a repetitive, expensive chore. This will be my 13th experience since 2011, and it would have been 14 if London 2012 hadn't clashed with City-Chelsea.
We might even be returning before Christmas if we beat Fulham in the LC, and draw Tottenham Away.
However, I sense more than ever that the hardcore City away following is ageing, and starting to pick and choose.
No disgrace, but it's harder, and too expensive for the younger replacements to pick up the baton.
I also feel that it's creeping into other clubs as well