The biggest problem I see is that for it to benefit many people, many communities would want a station. You can't get anywhere quickly if you are stopping all the time. If stations are 100 km apart, most people won't take the train. I don't see it being cheaper than VIA and that is already in a awkward price bracket. Either you're cheap and drive or you don't mind spending and you can fly for not much more and collapse your trip time. Canada is not Europe. We have a hell of a long way to travel and not that many reasons to do it. Eg. who wants to take a high speed train to belleville?
Let's compare.
I had to go to quebec city last year.
I'm a single car family household (although i do have the motorcycle).
Riding wasn't an option back then due to undetermined stay to luggage was needed.
But
driving or riding there is about
8 hours, takes about a gas tank and a half to get there in a car (about
$75-80), 2+ gas tanks on the bike (about
$60) and then i have freedom to do what i want once i'm there although i might be a bit tired.
The
train takes
10 hours and i can't even work since its an unsecured wifi, i get there, have to get a taxi but i'm more rested, costs
$170
The
plane takes about 1.5 hours (it's longer now since gotta stop in Montreal) you gotta be there an hour before at a minimum and takes about 30 minutes to get there and come back, so about
3.5 hours and if i'm lucky i have someone to give me a ride, otherwise its about $40 in taxi in YYZ and $25 taxi in YQB and the ticket is $440 so possibly
$500.
So if they can get me a train that does it in half the time for maybe %25 more expensive, i'd be down. Make it Windsor, Hamilton, Toronto, Kingston, Montreal, Quebec at high speed and other cities with slightly slow VIA... you'd be in business...but obviously i'm not the first who's thought about this.
EDIT) oh and in covid times, you gotta take into consideration that train or plane = mask the whole time. Which is just an inconvenience and 10 hours masked might be a make or break for some people