text: "Further a switch to proportional representation would almost certainly require a constitutional amendment."
  
  Nonsense.
  
  Did extension of the franchise to women require a constitutional amendment?
  Did elimination of the property requirement require a constitutional amendment?
  Did lowering the voting age to 18 require a constitutional amendment?
  
  There have been over 30 amendments to the Elections Act since Confederation.  Not one of them has required a constitutional amendment - or a referendum, for that matter.