Huh? That is exactly what HFR (which you seem opposed to) is about. Its original name was the Dedicated Tracks program.
The fear is that the plan become too expensive and the politicians deciding to cancel it, like they have every other time HSR has been proposed in this country. Some say that the definition of insanity is doing the same thing over and over again and expecting a different result. Maybe you are too young to remember all of the other HSR proposals that went nowhere (according to
this link, there have been 26 Ontario-Quebec HSR studies since 1970).
I don't know about you, but I would rather see some improvement to VIA Rail than spend the next century dreaming about how it should be improved and criticizing any improvements that don't meet some arbitrary, high standard.
So why do you think people are opposed to VIA having their own RoW?
The key is public support. Part of the problem is that half of Canadians live outside the Windsor-Quebec corridor, and resent money being spent inside Ontario and Quebec. Even among those who do, they don't care about trains. Then you get groups (like the airlines) that will see their business model hurt by HSR and will throw massive amounts of money campaigning against HSR (notice that one of the HSR studies I linked to was by "Air Canada/CP Rail" around the same time as momentum was building for HSR in the early 90's).
I am not opposed to HSR, but am tired of all the hot air on the subject and see HFR as the an opportunity to actually see the yard sticks move down the field. Keeping the football analogy, I see fighting for HSR now is like its 3rd and inches (CFL of course) and rather than doing a
quarterback sneak to get a 1st down, you decide to throw up a
Hail Mary and risk turning the ball over on downs.