My main point was rather then introduce a brand new design which would not work in multiple with existing stock, it was far better to use a design which works out of the box admittedly something Bombardier is not always known for,
For example, it's time we all learnt from our mistakes of ordering various subclasses of what ought to be standardised stock ie Virgin with the Class 220s/221s, Central Trains/Southern with the 170s/171s etc....
The Class 172 is a design which works, is already proven and is compatible with existing stock - it would also be far cheaper to order then having to worry about the research/development of a brand new design.
That being said, I can see the 14X fleets still in use many years after the various electrification schemes are completed.