But due to the new hardfork we will have 2!! versions of Bitcoin, which means that block halving gets evaporated and is meaningless (only if Bitcoin is still alive until 2016)! 
there will no be two client, at the end one will prevail on the other because of general consensus, and there will be only one block halving(before someone say that bullshit too)...
and two thing willo nly happen, we don't need to repeat it endlessly
price increase or hashrate decrease, int he form of x2 or 1/2