Litecoin was somewhat interesting as long as it stayed GPU only. Now it is just a version of Bitcoin without the first mover advantage.
Ltc will surpass btc with mass adoption soon enough, not many serious investors will risk an anon dev especially with such a large stake, thats the huge advantage ltc has over btc.
Surpass BTC? LTC is more or less useless. If any were to surprass BTC it will be one of these new coins like NXT, XCP etc.