When Bitcoin gets to a stage where the mined supply is basically 21m (that is, very little remaining btc left to be mined), will Bitcoin still remain a secure network?
If you keep looking at all these things, then you’re sure going to drop out before that time comes, because you will discouraged. There are always a disadvantage to things, and there are also the advantages.
Moreover what you’re talking about now is something that is going to happen in many years to come, I believe before that time comes we are going to see a way to get around this, there’s going to be a solution for sure. And also when that time comes, the system will change and miners are going to be benefiting through transaction fees. There will likely be lots of people using cryptocurrency for transactions by then.