Lightning has already been implemented on Bitcoin Core ... I know this since I've used BTC to transact for airline and hotel stays ... and the wait times are less than 3 minutes, and the fees are less than 5 USD, instead of the ridiculous 30+ USD from back in January. Bitcoin is still here to stay ... its the most prevalently used cryptocurrency to transact at the moment.
Other altcoins such as LTC or even Ripple that keep claiming "fast times" and "low transaction" fees ... need to differentiate themselves other than just claiming that .. because Bitcoin can always implement updates that help it keep the fast times and low transaction fees. LTC and Ripple don't do much else.
As ETH is more of a platform, rather than an actual currency, I see ETH (and the Chinese equivalent NEO), along with all of their respective tokens still growing.