I believe miners have already acknowledged that the payout would be reduced by half following the halving. That is why the miners' moto would always be "today is the best day to mine Bitcoin." However, as the graphic shows, Bitcoin prices always rise after the halving. That is, the investor would benefit greatly, but the miners would benefit a little bit. If a miner quits their job, I'm confident there will be another to take their place. So I don't think there's anything to be concerned about there.