Rather than react to it as a bank shareholder SFI,who hates to hear the word "bubble".........think about this idea  on its merit.Do some "thought experiments".
It has no merit....
It has no logic.
It is a back dredged "regression to the mean" observation... deconstructed into plan, based on hind site.
Meanwhile the far bigger picture might be that they are quite possibly  all big overstuffed lemmings about to run right into the exact same  bag of trouble...remember 8 years ago ??
Honestly....the TSX deserves just exactly what it gets over time...