I hope all copy-paste coins without any innovation at all like litecoin will disappear soon.
You are clueless about LTC aren't you?
Are you aware that most changes happening to BTC recently are trying to copy LTC improvements???
Litecoin was a copy of Bitcoin foundationally, but only because it aimed to improve on the Bitcoin architecture. But it's not exactly accurate to say that Bitcoin has copied Litecoin improvements. Most of the new improvements such as SegWit and Lightning Network still come up from discussions that are sourced from Bitcoin developers. But Litecoin does manage to test it first, and successfully. They have easier consensus so that is one of the reasons.
But yes, Litecoin, even if just a testing ground for improvements that are meant for Bitcoin, has great value in that sense.