Well yeah, I don't propose routeing the Oxford-Bedford trains via MKC anyway. Would just slow them down without giving MKC any extra destinations. I'm just saying the chord is easily viable and would be for faster MKC-Bedford trains, as well as MKC-Luton, freight and diversions.
I think what I gain from these discussions is that Beeching never thought in a million years that there would be viable cross country railways. We now see this was wrong (I don't blame Beeching, at the time we thought there was a doubtful future for rail, full stop).
What we now see in the case of the Bletchley / MK conundrum is that the E/W line would have gone through the centre of MK without going near Beltchley. That would have been the proposal if the new town had been planned with rail in mind instead of the reverse.
So we are now shoe-horning existing rail connections into old formations that were designed for another era, as the discussion about the WRR / LNWR /GWR rivalries exposed.
I fully believe that the notion that eventually the E/W pax railway service will not go to MKC and reverse is a shortsighted one.