Im glad you got there first for that one, I seriously laughed out loud to it....
15 is asking a lot too. Its only south of Princes Risborough you are really going to gain. High Wycombe still stuffs you. I'll take a look at what you have got in the May 11 timetable.
4 to 5 for the Shrewsbury to Oxley is optimistic too, the classic "de-scope" has happened on that one. You should be odds on for 3 though but don't bet on a better path because of it though. Id put cash on you sitting at Wolves North twiddling your thumbs. Id start you later at Wrexham if it were me.
Planner I think 15mins is realistic, as far as I am aware it will be 100mph running for 67/mk3/DVT from Banbury to Ruislip, ok so Aynho, Risborough & Wycombe will be restricted, currently the only 100mph stretch is between Bicester and Risborough, when WSMR were limited to 60 it took 20minutes now it takes 13 minutes, the stretch from Aynho to Biscester currently is 85 mph, and from Risborough to Ruislipis 70, from Ruislip to Neasden is 60 going up to 80, with some maths I have worked it out that it will save 16 minutes accounting for 3 minutes lost due to slowing for the restrictions. However, you need a pretty good path for that to work, I have done Marylebone to Banbury in 59 minutes before with a good path where it is timed at 63 minutes at best. It would be interesting to read your results, look at the timings between Banbury and London after EG3 is upand running.
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The end of WSMR and the start of WCML services to Shropshire? Yes, that would be a shame.
If DB get the WCML it will be a separate sub company, the same as XC, ATW, Chiltern & WSMR. They willallhave to answer finally to DB but I cannot see a London Shropshire service being set up, fistly from Wolves you need diesel power, there are not enough super Voyagers currently let alone finding more for this run, it is not practical with the HS timetable to have trains running at 110mph on the WCML as this will cause a lul for the 125 pendos. There seems a lot of 2nd guessing here.