one day miners will be difficult to produce bitcoin because as I know when bitcoin is getting closer to supply then the level of difficulty to break blocks that can produce bitcoin will increase even the result of miners will be drastically reduced, so the supply limit of bitcoin will have an impact on price and life bitcoin in the future.
because when bitcoin becomes more difficult to obtain there are 2 choices, humans can still use bitcoin but with very high transaction costs or humans don't use it anymore because bitcoin prices are too high only that is likely to happen in the future when bitcoin has reached the maximum supply limit .
Seems like you don't know what you're talking about its not that the difficulty of solving blocks changes from halvening, that would be the block rewards, originally when a block was solved it rewarded 50 bitcoin, now that is not the case, the amount is halved each time, the difficulty of solving the block is based on how many people are working on solving the problem, the blocks readjust to try and be solved around 10 minutes each block.
Kingcolex explained well it to you mate, g+.
I also think that he has no idea what he's saying about block rewards and he's only talking about the increase in difficulty. The adjustment of rewards is there and even the price will adjust too because of the cost of mining.
The production let's say that you have understood it as the miners reward will be lessen but the value of it will increase due to several factors that we're talking and one of it is the halving.