That depends on your perspective.
It is in the government's interests that all journeys that can be made by HS2 are, since HS2 will cost much less to run per passenger-km than a conventional train would.
So I expect HS2 to be priced to absolutely crush the long distance WCML/ECML/MML/Chiltern market.
Yes, to a degree - they will still want to retain flexibility within the infrastructure and provide a base-line discount alternative - a tier somewhat similar to that performed by coach services now.
The best way to reduce subsidies would be to pile it high and sell it cheap, since the largest fraction of the levelised cost will be capital expenditure on track and such.
Agreed, and that was the reasoning behind my proposal to have airline operators involved to develop the yield-management based model for ticket pricing - i.e. to run it as an equivalent to easyJet/RyanAir - however the base costs are far too high for that to work successfully.