@Jodatu You wouldn't get 20 coaches into New St, and you'd have to raise the roof - forget it!
@Jodatu High speed should be just that - limited stop (which hs2 is), stations that provide onward connections (which hs2 does very poorly)
@Jodatu You wouldn't want 3 stations in Birmingham serving #HS2 - also, double deck, 400m long trains not compatible with classic track
@Jodatu You could make that argument about any central station or hub airport. Reality is, origin + connection passengers justify both