That's a very good point. There's no doubt that HS2 will be treated as a premium product as is the case with the rest of Europe. Indeed look at the ECML and the pricing policy of East Coast compared to FCC. In my view there is nothing wrong with this policy but let's not bury our head's in the sand over this.
The guidelines for the analysis that contributes towards the justification of the HS2 project explicitly states that ticket prices on HS2 services will be maintained inline with current/future comparable services between the major centres in order to attract customers away from the existing long-distance service patterns.
This guideline was used in conjunction with point-to-point service improvements as the basis for modelling the migration of customers to the proposed HS2 hosted services. Beyond that, yeild-management is likely to be used as a tool to alleviate crowding on parts of the network.
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Probably exactly what has happened to Kent services when HS1 was opened up to Southeastern. The fast trains were removed from the classic lines and were made stoppers considerably adding to the journey time, and the only fast trains being the ones via HS1 with an added premium to the ticket price.
That was the plan all along; the intent was to adjust the then existing services to provide additional capacity at the intermediate stations on the classic routes.
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Just came across this article which indicates in the sixth bullet point that the House of Lords Economic Affairs Committee will review ticketing asking "Should travellers pay higher fares on HS2 than other lines?". This essentially questions a key assumption used in the analysis of the options for future service patterns and so is potentially disruptive to progress on the project, as are the other points,, if they come to a different conclusion.
House of Lords to investigate economic case for HS2:
http://www.railtechnologymagazine.com/Rail-News/house-of-lords-to-investigate-economic-case-for-hs2
