Don't build castles in the air. Gondia will hardly gain any importance because of the new route. Have you even checked the current number of trains between JBP and NGP? Hardly three dailies. Even if all the trains are shifted, no significant rush will commence in the recent years.
Both of your dreams regarding shifting of SECR HQ and Duronto halts are never turning into reality.
The route via G will only shorten and be beneficial for JBP NGP/south trains. Neither mumbai/west nor kolkata/east connectivity will benefit