BFL ASIC can never be used to mine LTC but CAN be used to mine NMC.
GPU can mine both NMC / BTC ( SHA256 algo) and LTC ( scrypt algo ).
FPGA can do same thing as GPU but the technology is hard to work out and nobody wants to share. I can bet my ass off somebody right NOW is making a killing mining LTC scrypt with FPGAs but not sharing the secret.
LTC is not supported enough by the market like BTC is due to Silk Road drugs buyers so mining LTC with all the GPUs previously used to mine BTC = market fail due to people dumping.
Nobody is willing to prop up LTC rate. Eventually profits will be same like BTC and GPU mining in ASIC period. LTC market depth is not big enough to sustain that many GPUs.
Looks like Bulanula has been taking notes.
Perhaps you should look into the litecoin code yourself to see how the algorithm works and why ASICS will be a while away from hitting any development. Hint: price for on-board cache.
Good job Bula!