Day to day you buy food, groceries, gas etc., and very rarely can you pay in BTC. When that changes, then LN should thrive.
I guess that the LN is just starting to blossom. Fortunately, SegWit adoption is growing at an unprecedented rate paving the way for LN's widespread use in the not-so-distant future. I believe developers would need to work harder on making LN wallets more friendlier to the end user. Only that way, mainstream adoption for the LN will increase at a fast pace. To my surprise, several crypto companies and startups have started supporting the LN. But the "Layer-Two" scaling solution is still behind on-chain payments.
At least, SegWit provides a relief as it provides a discount in fees for on-chain payments. Most BTC wallets nowadays support P2SH and native-SegWit (Bech32) addresses. Even some exchanges have begun accepting SegWit payments, which is a good sign. I have to say that the LN has quite a lot of BTC locked in HTLCs (Hashed Time Locked Contracts). This shows us that there's a huge level of interest/demand into Bitcoin's "Layer-Two" scaling solution. The LN is still experimental, so it cannot be used for large amounts of Bitcoin. Rest assured that developers are working hard to make LN as secure and resilient as possible. One feature I look forward to is atomic swaps. This would completely revolutionize crypto trading as people will be able to quickly trade from one crypto to another without the need for a decentralized exchange or a third party. Submarine Swaps is also a great upcoming feature for the Lightning Network (LN) which enables users to exchange from Bitcoin to LNBTC in a seamless manner. Slowly but surely, LN's adoption will grow until most businesses and customers use it for micropayments in the mainstream world. Once the LN is stable for mainstream use, Bitcoin would've achieved massive scalability in the crypto/Blockchain space. Just my opinion