What happens if the BTC price doesnt rise and it is not proffitable for miners to mine? They will quit and the BTC network gets insecure?
the miner will move to altcoin and bitcoin network will slower and slower so many unconfirmed transaction will make a queue and bottleneck will happen
miner is the most important thing in blockchain system
the miners will love bitcoin more, they will not leave bitcoin as the price of bitcoin will double up and the half reward will not affect the miners as they will get a doubled value bitcoins.
and the miners will also have big piles of bitcoins in their wallets so when the halving will occur an the price will increase they will also earn a good profit, so they also favor bitcoin.