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.
The litecoin may test the segwit for the bitcoin.