You're being extremely optimistic about BJP's prospects in the South bro. Karnataka is the only State where they can make some substantial seat gains, and mind you, JD(S) is still a force to reckon with in many Southern districts of Karnataka. They'll predictably draw a zilch for themselves and 6-7 seats from DMK/MDMK in Tamil Nadu, will be lucky if they win 1-2 seats in Kerala(still unlikely), and at max hope to gain 10 seats from their TDP alliance in Andhra. Not more than 35 seats from the South for NDA this time, if seen in a more realistic light.
Did i say they are in a position to win more seats in south? Nah, I said they are in better position when compare to earlier elections. Along with Karnataka, in Andhra also they may get good candidates to place in coming elections atleast. The current Congress MP's who are projecting themselves as the fighters for United Andhra (against cong decission) needs a party to contest now in 2014, most of them are in talks with BJP. Even if state division happens, KCR is one of the most selfish, don't get surprise if he supports BJP after poll.