10 years. Moreover, the most difficult time will come in 3 years. This is similar to the Great Depression. But there is a difference from that time - the whole world will be depressed without exception. Well, China has just suffered the least, but the dominant China is also not a pleasant event.
I don't believe we'll meet China as the most dominant country overall in this decade (At least).
But at the moment they have a lot more crypto mine farms so they already centralize some of the cryptos.
I hope this tendency will end