Depends when you'r basing the start of the decline from. Between 2011 and 2012, Man United have declined.
Because other Chelsea and City got benefactors allowing them to rise past us whilst we didn't follow so the good players we have leave to further their ambition and we clearly don't have a lot of cash to spend. Where is this money you all speak of?
I thought the argument was Napoli v Arsenal. Obviously if the likes of City, United, Chelsea etc came calling then we wouldn't really stand a chance
One season isnt a decline. For a decline you need a trend, one season doesn't give you a trend. A gradual fall over 7-8 seasons most certainly is, as there is a declining trend. Doesn't bother me as a United fan, one less title rival. But certain sections of the Arsenal support should be asking what their £1000 a year season ticket is getting them.