We are not really known for "real world basis" for our grandiose thoughts. People keep talking about Akhand Bharat with factoring in the fact that it would necessarily mean taking in some 400 million Muslims. Even PoK is a nightmare. Some really take the idea of Vasudhaiv Kutumbakam too seriously.....
Basically annexing such already disrupted and hostile land masses with inert public sentiment already predominantly hardened against India by any means will create more issues like red menace or insurgency like NE or dare hue santicami like North top ( except PoK though, usko to sath dekh ke hi marunga)!! Better to be content with what we have salvaged to integrate already and move on to flourish it. It's better to cut and forget the fingers with frostbite, than keeping it for 5 fingers's sake and inviting gangrene !!!
AKhand Bharat is frankly speaking, is something like going Oxymoronic Chutiyapa, Bangladesh is already fully radicalized and most public sentiment there is Fully anti India. Same with Myanmar, Pakstan and Afganistan. Nepal though being to going back to be Hindu rastra again, no way can be called on the same boat with India!! ALL of them take us as bully while milks us every way possible economically!