I believe that in the future there will be a coin that is able to implement a very large plan. Overtake bitcoin, increase payment processing speed, with minimum Commission, and high throughput up to 1 million transactions per second. That's when bitcoin will take a back seat.
I also think sooner or later this could happen. The limitations around transaction speed and costs are not very obvious right now, but that is not due to lightning but rather the super low volume. I used bitcoin for a payment few days ago and only paid 15cents. But this won't stay like this forever. I still remember the frustrations of people last yesr when it took days for transactions to get confirmed.