Fans are at fault because they lower the standards even further, which means the board can enjoy the free ride as well.
As for rebuild - it hugely depends on the next manager, but we do need a RB, CB, LB(at least a backup, but considering Shaw's form this season...), not one but two CM's and a #9(both our options are 35-37 years olds).
We need to ship players like Jones, Bailly, Mata, Martial, Fred, Telles, one of the 5 GK's we currently have in the first team,etc. That qualifies for a rebuild in my book.