Lightning might not help at all, but the fact that the dev team is surfacing publicly and have laid out a year long plan should.
Yeah. As long as Litecoin continues to follow Bitcoin's footsteps, then it may become stable and successful for the long term, even if it lacks innovation. The adoption of SegWit on Litecoin will serve as a testing ground for Bitcoin, as well as the Lightning Network when it becomes active.
It shows that both Litecoin and Bitcoin will remain as solid cryptocurrencies for years to come. Considering that Litecoin is silver to Bitcoin's gold, it may continue to be used for quite a long time.
Nevertheless, we will see what will happen with SegWit and Lightning Network on Litecoin before it gets implemented on Bitcoin. It would need to be heavily tested before it can become used on the world's largest cryptocurrency. Just my thoughts.