Less miners = More Demand = increasing price, as simple as that.
but isn't that will make bitcoin become centralized?
because the number of people who help run nodes for mining is decreases
AFAIK miner china is the biggest hashrate holder on the bitcoin network
I think that reducing the number of miners will make Bitcoin centralized, because there will still be many miners in other countries that continue to bitcoin mining. But I'm not sure that the ban of China will increase the price, because the number of mined bitcoins remains the same as it was before the ban.