I am not saying that mass migration will happen but presenting a worst case scenario. What percentage of people will migrate is doubtful at this time?? It is possible most andhrites will not migrate and just go for pongal. As new job opportunities develop in a new capital some may be tempted to move back.
Ideally I prefer Hyderabad to be union territory because you don't want to kill the growth of a happening city.
The official statistics show that of the Rs 69,146 crore revenue that accrued to the exchequer from its own sources such as Value Added Tax, Rs 36,400 crore is from Hyderabad alone. The revenue from the Andhra region is Rs 16,729 crore, from Rayalaseema, Rs 4,809 crore and Telangana, Rs 11,206 crore.
Telangana with Hyderabad as capital will have total revenue of Rs 47606 crores of which Hyd. contribution comes to 75 % revenue. Rest of Telangana will generate about 25%.
Rest of Andhra including Rayalaseema will have about Rs 22000 crores revenue so, does have some problems and with little bit of help from center can develop one of their tier 2 cities to rival Hyderabad. They have 3 developed ports which could attract industries.