Creating an ASIC for Bitcoin is child's play compared to designing a Scrypt ASIC. With Bitcoin, you can just keep throwing a numerous amount of faster parallel processors at it. Scrypt, on the other hand, requires more and more memory bandwidth to improve its speed. When you find a way to readily manufacture tons of cards with >GDRR5 memory, Litecoin would be a waste of your time compared to selling such an advancment to various manufacturing companies.