Terry -
I don't think minimalism can EVER jumped the shark. Like many other terms (e.g. fiscal conservative, god, independent film), it has now been around long enough and is being used by so many people to describe so many different (and sometimes mutually-exclusive) elements/ characteristics/ attributes that it has become forever SAFE from ever jumping the shark, given its amorphous and innocuous nature/definition. It CAN'T be analogous to any situation involving The Foz - in that case, we all knew (or thought we knew) exactly who the jean-and-leather-jacket-wearing little hoodlum known as Arthur Fonzarelli was, and we knew (or thought we knew) that he only ever rode a motobike. The whole world, collectively, was in agreement on this, and it was crystal clear. So when the Foz donned shorts and got on water skis to jump a shark, we were all, understandably, shocked and dismayed. Unlike minimalism, which no matter what it becomes, can't shock us (or most of us anyway) anymore....
Peter