The Shrewsbury service would be better off continuing to Chester that way a more frequent service could be offered to/from London and aswell and Chester will still keep its hourly service - 1 train at 2 hourly intervals via Crewe, the other via Shrewsbury/Telford and Birmingham.
Except the via Brum train would be overtaken by the via Crewe train even though it started an hour later. The good folk of Chester would not be amused.