I'm pretty sure Litecoin will still be a testbed for Bitcoin and for that reason enjoy some degree of popularity, but it's definitely not the 'Silver' to Bitcoin, and it never has been. It was something made up by those supporting Litecoin to make it look cooler than it actually is.

In the end, Litecoin's all time charts are ugly af. It's extremely bearish when you 5 years later dump far below your 2013 high. Solid indication that you're dealing with rubbish here.