In the next few decades, this may be true. No altcoin or technology can threaten bitcoin's leadership position but in the more distant future it is difficult to say.
In all fairness, bitcoin is a product and result of technological development. Meanwhile, as we all see, technology is constantly evolving and even evolving extremely rapidly. So it's hard to know what will happen and we shouldn't be surprised if something outperforms bitcoin in the future. But like I said, that's not going to happen anytime soon, so there's no point in thinking about those things right now.
And just to add on this, Bitcoin has seen brutal crashes, insane runs, the coldest bears and the wildest bulls. After thousands of debates and endless altcoin hype cycles, it keeps proving the doubters wrong every time. It’s here to stay, no matter how hard they try to box it in. Funny thing is, back in 2010 someone paid 10,000 BTC for two pizzas. Today that same amount could buy a few private islands lol.