Feeling bored in the Train - talk to a RailFan. You'll WISH the train gets late.

Nagpur is second capital of MH, not Pune. That makes it more important, politically. there no biased decision there.
The CM frm NGP reportedly gave funds for the rakes of the expected CSTM-NDLS Rajdhani train, which gives no benefit to Nagpur.
You are comparing Mumbai-Pune with Mumbai-Nagpur.
The actual comparison should be Mumbai-Howrah and Mumbai-Nagpur.
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big distance of Mumbai Delhi is getting upgraded to 160 kmph being a 'A' class route (potentials of 160 kph), that is real big distance in just one go.
Similarly, We have Mumbai Howrah amongst A class routes, out which Mumbai Nagpur might be done in first leg, be it upgradation of existing double electrified route from 110 Kmph to 160 kmph Nagpur-Igatpuri like for NDLS-BCT or separate new Corridor like for Bandra-Kurla C to Ahemdabad Bullet, using the same BKC terminal for both.
Nagpur comes in centre of 4 metros to be connected by High Speed out of which most economical for Nagpur, surely would be Nagpur-Mumbai route for obvious reasons, so, when opportunity strikes, why not it a consideration?
Besides, Just one route Mumbai Ahemdabad
how much will it benefit actually? Same terminal could be used for Mumbai Nagpur as well.
From Ahemdabad where would it get extended its unclear but if Mumbai Nagpur gets bullet, it can extended to Nagpur Howrah.
Ofcourse, great work would be required through the Thull ghats, but when Katra can get connected likewise, why cant this one?