At this point, Brown (assuming he's elected next spring) would be wise to stick with cap & trade until 2019. If Justin and Butts get the boot and the new CPC government scraps the carbon tax, then dismantle cap & trade and don't replace it with anything.  If we are faced with another 4 years of the sock puppet, then switch to a revenue neutral carbon tax because the provinces will continue to be strong-armed into it by Climate Barbie.