In 1987 I was part of liaison committees that included Parks Canada, based in the Rocky Mountains.  The situation you speak of was evident even then.  At the time we discussed strategies for restoring the clearly older preponderant age class distribution of the parks with clear warning that  catastrophic conflagration type fire would soon happen. We saw this occur in Kootenay park in 2003. Since then parks has been gradually embracing pyral methods to reduce the imbalance.   

I appreciate Parks Canada's concern about keeping access down, wilderness is a vital part of the PArks mandate.   More work needs to be done on public information regarding the healthy role of fire in boreal and sub boreal forests.