No, you are not getting it! I feel like I am repeating myself but I will try to explain again:
The world population will increase for the next few years. There is nothing we can do about that. It’s due to a “fill up of adults” in older age groups, not because people are having more children than before.
in fact, people everywhere are having fewer and fewer children.
The UK population will decline from 2025. This will bring challenges that will have to addressed in some way. Either by bringing in more people from abroad, or by something else. I would like to discuss what the something else might be, because immigration is not a long term solution. Politicians are not being honest with voters because they are making claims about being able to cut immigration without discussing how else they might tackle the issues of demographic change. There seems to be little awareness or planning. Look at Japan or Italy to see what the challenges might be of a declining population with low immigration.
The world population will also peak and start to decline, some time after 2050, repeating these issues across every country. I worry that in some countries the something else the governments might go for would be to restrict abortion or euthanise the elderly and disabled.
All the more reason for the UK and other western countries who will get there first to start thinking about how they can model a better something else.
So the short term issue is an aging population and social and economic problems with a declining population, empty housing, not enough people to staff businesses, teach, staff hospitals, staff the army etc etc.
My view is that we might want to look at why people who want children in the UK are not having them, because if the birth rate improved slightly then we could have a slower decline and make the necessary adaptations to new the societal structure. A slower decline of population. Not an increase in population.
The long term issue with the birth rates is that if they fall below replacement rate worldwide and never recover, humans will not just decline really rapidly but also die out completely. So we do need to think one day about getting rates back to about 2. Not to increase the population at all. To stop the decline and have a stable population (which will be less than today) that the earth can support and that is neither increasing nor decreasing.
A birth rate of anything up to and including 2 does not lead to any increase in human population. That’s a good thing. Humans needed to stop increasing.