Lightning is the only possibility that Bitcoin ever becomes a universally adopted payment method but it has its own issues. The main issue is when the payee's transaction is unable to find a route through the nodes/channels and it gets stuck in transition attempting to find a route. This issue is becoming less of a problem and it will continue to do so with the ever increasing amount of nodes and channels popping up. However, when you factor in the capacity of those nodes/channels (amount of sats/BTC that the route can handle a transaction through) that adds more issues because.then you're unable to transact over a certain amount. Lightning is really only feasible though for transactions that are smaller than 500,000-1,000,000 to my knowledge. There are some channels with a lot more capacity than that but a lot of them have around only that amount at least to my knowledge.