bullet trains are hugely expensive you wont get that price point.. besides as
@Archie said its too long distance.
You will have to run many bullet trains to make it viable, I doubt we got that sort of traffic. People would rather take a detour than pay toll fee(toll roads need 10 to 20 years to make any money), so I wont know how much traffic you can divert to bullet train. Basically you cant.
If they do decide, I would expect them to have separate corporation and raise money from market or via debt financing(without soverign guarantee), let people who can dream pay. Market usually gets this sort of things right.