The entire cryptocurrency market capitalization is a toddler when compared to the global markets like the stock market and the commodity market. considering where Bitcoin started, the whole ecosystem have come a long way since the past decade.
Bitcoin has been the dominant cryptocurrency for long now, I think that could change in the future. For the market to grow large and compete with global market, its becoming clear that other cryptocurrencies might rise to compete with the Bitcoin's marketcap. Top players from the traditional market need to get involved in cryptocurrency and issue decentralized products, the space need a lot of attention at this time. Such close competition could be setting the stage for a multi trillion crypto market.
But then, what is uncertain is regulation, can cryptocurrency grow into a multi-trilion market without the proper regulations?
What are you basing this off of? What are you seeing that is showing that other cryptocurrencies are on their way to becoming as large or even better than bitcoin? I sure don't see it. One other thing you need to realize is bitcoins blockchain is the only chain that has been truly tested at such high levels. There is no proof or positivity that if another chain gets to a 20k type level, that it will be able to handle it. A lot of this feels like mostly conjecture here.