Generally I have little faith in the Libs to stay true to any promises, but its not like this issue was a surprise to ‘the hoard’ as they did campaign on it. Also if Justin wants a grand ole legacy akin to his pa (CCoRaF) or Obama (Health Care), he needs to think towards the greater needs of the country over petty politics. Our democracy lacks serious legitimacy due to the outdated FPTP system. If the Grits are too scared of the ‘real change’ that an accurate proportional representation system brings (I favour MMP) then the adoption of a wishy-washy half-measure like the AV/STV would still be an improvement.
However Justin might not be the great leader/proponent of change that he makes himself out to be. He has the means/mandate, only time will tell.