Much to the chagrin of the NDP the pipeline probably cost them more votes than the shattered hopes of electoral reform.
But also TBF, the vast majority of Electoral Reform voters were squarely in the NDP/Green bases to begin with. And the Liberal voters only cared as far as being annoyed that the Conservatives kept on kicking their asses. So them not going through with it just makes the actual supporters want to return to their natural homes, while leaving the Liberals still happy since they are still in power.
But then again. Once the Conservatives go back to kicking their asses because the left returns to being naturally split, then the Liberal Voters will be back kicking and screaming, conveniently forgetting that once upon a time they had a chance to fix their little problem and they didn't take it. And the new wave of youth that is entirely for Electoral Reform won't know the history as well. Leaving us prime for history to repeat itself. As is tradition.