Sending small amount of BTC nowadays is not viable at all because of the fees. Will LN greatly help solve the current issue of high transaction fees?
It will definitely help the transaction fees and transaction times. But will it be enough? For us to be able to send small amounts without paying higher in fees? We don't know yet. Time will tell.
*fingers crossed*Also, why is Segwit not implemented by popular exchanges like Coinbase and some online wallets when it could help lower the transaction fees? I've read that the adoption rate of Segwit is merely 15-18% only and have already fallen low. If ever LN does come, would it be widely accepted or just the same as Segwit?
Most exchanges and services are still probably working on using SegWit addresses to their systems. I don't know how SegWit works in a code level so I'm really not sure, but it will probably take a bit of time before every exchange and service uses SegWit.
I think Segwit won't be enough but at least it'll act as a band-aid to the high fees we are experiencing right now.
Hopefully, LN does work as intended and widely adopted if it comes already.