I've posted in other threads that as BTC continues to make the transition from "underground" to "mainstream" (more adoption every day, more wall st. types involved every day, etc.) there is going to be a void. With more acceptance will come more scrutiny & regulation. People who (have) used BTC to buy pot, buy guns, send money across the globe for whatever reason will (at some point) shy away from BTC due to the above.
There needs to be a legit alternative to BTC that is viable. Will it be LTC? My guess is likely not. I just don't see a whole lot from the LTC community in terms of evolution and innovation of the coin.
Which coin is it? No idea, but there are only a handful (if that) that could emerge that are bringing either actual innovation to the table or have a legit community behind it (not going to name names)... but I don't think it will be an IPO coin or a POS coin that proves to be viable long-term.