Ah great, a perfect plan all round!
So Cardiff - Portsmouth returns to being overcrowded (potential flashbacks to the memories of the overcrowding problems of 2007?), Cornwall returns to an hourly service pattern despite all the work put into the Half Hourly timetable and the already fairly slow Intercity services to London end up finding themselves slowed down further to pick up the slack. First Kernow / Transport for Cornwall start taking notes now!
I've felt for a long time GWR has overstretched itself (the haste to see off the 143s and 153s for example, chasing to rely on stretching the 150 / 158 / HST Fleets further), reliance on 769s releasing Turbo's to fix the West Fleet issues etc. But this seems to be service cutbacks by cutting the fleet. All very disappointing.