Lived there for three years. Loved every minute of it.
The traffic counts on both 11 or 17 aren't spectacular; although more commercial traffic does shift to Hwy 11 in the winter.
Every winter is a challenge, but this year has been particularly disruptive. Highway alignment is only part of it. Maintenance standards, CMV licencing standards and fleet operating practices are also big contributors.
As a very (very) rough gauge, Ontario builds about 25 km of greenfield highway every 3 years or so. That is obviously preceded by years of surveying, design and land acquisition. Right now they are slowly pushing a divided 17 up the Ottawa Valley and extending Hwy 69/400 towards Sudbury. FN land negotiations can bog things down.
Given the historic amount they can build, and given the amount of highway to do to create an end-to-end twinned highway, do the math. None of us would live to see it and likely our kids wouldn't either.