I have a few comments regarding the above diagram:
1) I anticipate that both Finstock and Combe will finally be properly closed when the line is eventually (re)doubled between Hanborough and Charlbury.
2) Is it anticipated that the other two limited service stations of Ascott-under-Wychwood and Shipton will also be closed, being as they are absent from the diagram?
3) How is it expected to make a local journey from either Charlbury or Kingham to Honeybourne, Evesham, or Pershore? Also, is the Malvern/Hereford train (which calls at Honeybourne, Evesham, and Pershore) going to be behind the Kidderminster train (which is the one that calls Charlbury and Kingham) which will enable a simple change of train at Moreton-in-Marsh?
4) I believe it would be better to continue the Kidderminster trains to Stourbridge Junction, as from what I recall (as that was my original neck of the woods) there are various sidings and loops beyond the signalbox (if it is still standing today) at the Wolverhampton/Birmingham end of the platforms. This would help clear the line as there are now 4 trains each hour between Kidderminster and Stourbridge.
5) The final bullet point in the diagram regarding connecting Birmingham with the North Cotswolds would be to keep it simple by extending a Stratford upon Avon train to Honeybourne. I do not want to see a larger version of the 1949-2009 incarnation of London Underground's Circle Line where trains are constantly in orbit, which would make it very hard to recover the timetable in times of heavy delays or disruption. Although London Overground have an Orbirail concept of their network, they are all separate sections with fixed terminal points e.g. Stratford, Richmond/Clapham Junction, Highbury & Islington/Dalston Junction, New Cross Gate/Crystal Palace, West Croydon/Clapham Junction via Peckham Rye. This helps to prevent delays spending around the orbital route.