We are going to hear a lot of "new" coins in the future that will be top coins as well, that is going to happen 100% without a doubt. People assume that we have a very strong top and that is sure but we have seen polkadot come in and destroy all that and move to be the third biggest coin behind btc and eth, I am not counting on USDT because that is not even a coin, it is just some company giving you ledger and that's it.

Long story short in the future this whole top 10 could change, it s harder for btc and eth to be moved from their spot, but I am sure 50% of it could change in a day, many things like USDT could be gone in a day, and others could just drop down while other new stuff come out. So, do not get attached to any "important" coin because they may not be so important forever, eventually they may lose all their value and become a lot worthless.