You been on the waccie baccie?I think HS2 should continue in order to realise the far-out benefits - better linkage with Europe, reduction in external and internal flights and internal road use, etc. Many of course will never use it but it will take pressure off what they do use. The analysis needs a hundred year horizon.
As to this four-minute stuff, the fewer the stations the less this matters. You can't have a High Speed link that potters from stop to stop like the Titfield Thunderbolt.