I don't know if they'll drop much anymore, 1GB costs close to nothing nowadays, and they have to be more expensive than DDR and so it's not going to happen unless they start giving DDR out for free.
The REAL question is when do DDR3 prices start dropping, it's ridiculous that you need to pay extra for a DDR3 board and the memory itself is so expensive that no one in their right mind will buy it.