Bitcoin is already being held like gold, just like every asset. Another coin which will be in the same category like is Ripple and Cardano. They have good potential in the future. Though, Bitcoin will always remain the best.
Bitcoin is not only held like gold, but its getting to gold marketcap as well, we need like less than 10x to be above gold in market cap, that's totally reachable for bitcoin, we have done bigger increases. Obviously we should try to go even higher than gold eventually, that should not be our max cap and stay there, but the day we beat gold will be a great day for everyone who holds bitcoin.
This is why I believe bitcoin is the one and only when we are talking about mostly used common crypto. Sure other ones could have a better blockchain, they could improve upon what bitcoin built, but it's such a big coin right now that even if you build a project that is 100x times better in blockchain, that doesn't mean that it will be worth more or used more than bitcoin. Even at these high tx fee's bitcoin is still leading the world in transaction amounts.