Well, basically block halving will affect miners financially.
Unfortunately, miners needs to upgrade their computer hardware such as GPU's for them to be able to solve blocks faster, since every halving, Bitcoin will become harder and harder to mine.
Eventually, some small time miners will shutdown due to the expenses in upgrading, electric consumption, and the continues halving of rewards.
Only those who have big mining farms is capable of sustaining their business.
You can't mine BTC profitably on a GPU or in your browser. The biggest factor in profitability is the cost of electricity. A small miner can make a good profit if they can get their electricity at a low cost.
So it's important to take care of miners profit.
The miners that are not profitable will stop mining, but mining will always be profitable to some miners. There is no danger of no miners being able to make a profit, no matter what the price is.
Well in order to be profitable miners should try mining rigs with low power consumption because it clearly depends on the Power consumption.
A miner's profitability depends on their costs compared to all other miners. That might be related to their power consumption, but not directly.
Could it be because the demands still the same while the supplies gets lesser and lesser?
The halving does not reduce the supply. It reduces the production. The supply does not get lesser and lesser. It continues to grow until it reaches 21 million.