A TVM at Adderly Park will last about 5 minutes! As for the high footfall at Duddeston, I expect a large proportion is people turning up at New Street with no tickets from other places but paying from the last stop!
LM will live to regret this, I hear that as part of their cuts to other ticket offices Worcester SH will close at 1100, FGW aren't happy with this as presumably they intend to de-staff the platforms for the same period meaning no dispatch staff.
Be better if Worcester SH, FS and the stations to HFD (with the exception of HFD itself) were transferred to FGW as they run quite a few trains along there, and are the only trains that really require dispatching (HST's) although I expect DfT would rather see the hours reduced to nothing!
FGW were intending to increase hours at some stations before the "credit crunch" but the plans were shelved.