There's a good chance that Bitcoin will lose his edge and another coin will step up.
But that moment is still very far. Right now there's a "bottleneck", but Bitcoin will pass it and evolve.
Although it's evolving slowly, maybe too slow, Bitcoin is quite mature now (so it may not need to evolve that much in the future) and it has a huge industry behind it. Bitcoin will need something really big to happen in order to lose his lead. And the competitor may not be even "born" yet.