But if people look at these things objectively, there is essentially 0% chance of any of this happening, let alone in our lifetimes or anytime remotely near it.
And when you look at the people spreading/making such predictions the timelines always coincidentally come just before their expected end of life.
When you accept the fact that you, and near to every other person alive today, will be dead in 80 years (and mostly far sooner) it rather significantly changes your perspective on life. Want to transfer your consciousness? Not gonna happen, but having a few children is at least a reasonable second.
Some people just believe in (and sometimes achieve!) fulfilment through other means. Problem is, that is objectively bad for economical and cultural growth of the humanity. No single country has been able to resolve that problem without religious beliefs or kinda forcing women to have children (by either taking all their opportunities away or them not having any by default).