407E is almost done. The third and final phase is underway and should open by 2020.
https://www.on407.ca/en/index.html
What the PCs could do is sell the whole extension, along with the two connector highways to 407ETR. Just make sure it's sold for a significant profit or else just operate it like the Liberals. Won't look good for voters though, selling the original 407 was one reason why the PCs lost power in the early 2000s.
I don't see this happening.