Why makes you feel optimism about LTC? I think SegWit won't give something for LTC. Because I don't see anything was being special caused by SegWit soon.
i don't think segwit will do much for ltc. i don't really see where the need is for it. it will be good for all crypto to see a working implementation. perhaps a fully upgraded ltc with all the bells and whistles might actually inspire more people to take a look at it.
realistically as an actual proposition for commerce it's far better than btc, quicker, lower fees, no shadiness, but if there's no demand then it isn't.