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
That's actually threatening but a single individual must have the 51% hashrate to control the network, but it isn't the case now, it would actually be scary if they join hands together.