First, its part of KJRs narrative last week. That blowhard guy who thinks hes a political shock jock (softy? sorry, Im not sure..Im not local and only listen to KJR when KIRO is playing something even more lame..) was complaining about all kinds of stuff that DOESNT ACTUALLY HAPPEN, and how he was unimpressed with the noise at the Cards and Rams games, etc. So, mostly, this is self fulfilling prophecy. He sees what he wants to see to fill in his narrative.
As people pointed out, half time lines were long..my friend went to get his beer and my toxic nachos and was gone a LONG TIME.. and yea, some people left pretty late but before it was technically done but most people doing that seemed to be people with kids (short attention spans) or with less than hard core significant others with them.
The 12th man is not slipping.. it was in full gear. Even pre game.. Temple was twice as full and full 30 minutes earlier than it has anytime this season.