You just need to look at Sampdoria, once competing in European finals and having the amazing accolade of being on the Subbuteo cover, now playing in Serie B. Most kids today probably don't know much about them.
Pub conversation in Genoa 5-10 years from now (translated from italian of course):
"Remember a team called 'Rangers?"
"Not really"
"Scottish team, Gattuso went there for a bit."
"Oh yeah, them, were they not the ones with the whole Protestant / Catholic thing going on?"
"Think so"
"F***ing archaeic eh?"
"Got that right. Whatever happened to them anyway"
"Dunno. Money problems, relegation I guess."
"Oh well"
"two Moretti's?"
"Please"
[never brought up in conversation ever again]