I actually hope Litecoin does adopt Segwit, because afterwards it will prove no-one uses it and no-one wants it.
every bitcoin project and developer that's currently stymied by the bitcoin stalemate will move over to have a play with litecoin, even if it's only for pure proof of concept.
I ain't got a clue what the price will do, but the only way litecoin's usage is going is up. it can't be much quieter than it is now anyway.