It will be much easier for them to go to bana banaya pakistan and Bangladesh till fight for a new Pakistan wages on. It's not that naya pakistan will born in fractions of time. The struggle will be long standing. In the meanwhile they will look for safe heavens nearby to seek refugee. See what's happening in Syria, they crowding from Turkey to Europe. If Indian Muslims face similar situation in India, first places they would run for are Pakistan or Bangladesh. Baki dono taraf to samunder hai.
What will actually happen, if this happens, a big if, is that the Sangh will attack Pakistan under the guise of attacks on our own soil. By manipulating the narrative among the west and putting all pawns in place first.
Translation: The Sangh wants to push things to a head, where Pakistan interferes openly.
But in time.
Not now.