Inter City Downgrade?

The additional class 321 units (Green sliding door trains) that are due to start arriving from London Midland in 2009 are due to provide longer trains on the London to Ipswich, Clacton, Colchester and Southend lines.  However reports in the railway press suggest they will also be used  to "... help provide additional capacity on services between Norwich and London...".  

Could this be another indication that the London to Norwich line is to be downgraded from Inter City status?