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You are right that every industrialized nation is facing a demographic decline. But it is handled differently in Europe than it is handled in the white crown colonies, in the US and in Eastern Asian countries. While those countries select at the border and only let the best ones in, Europe's nanny states are loser magnets and only attract the useless ones that need to be taken care of by those who work. Logically, this drains those countries from their tax payers on the long run. The highly qualified people leave, while there is a steady flow of young people with low or no qualifications from underdeveloped countries to Europe, whose aging taxpayers have to pay them for breathing and breeding.
If you want to peek into the future, then have a look at the kids in the age bracket 0 to 6 years. That is how the society will look 20 years from now. The countries our forefathers fought for are gone. And they are gone just because our forefathers chose to shoot at each other instead of having a beer together and learn from each other instead. He who dies in the field is no longer of any use for his country.
The decline of population in Europe starts around 1916, and the replacement started after WW2 in Britain and somewhat later in Germany. By now it is impossible to reverse, because that would mean increasing the birth rate from 0.9 to 4 children per woman.
While Japan's entire population will decline from 120 Million Japanese to 80 Million Japanese between now and 2050. They try to compensate this decline of population with automation and robotics. In Europe we try to compensate it with immigration. But there are no Chinese workaholics coming to Europe. It's mostly people who often can't even read and write in their own language, let alone being able to develop top products. This means that the old Europeans have to take care of these young people as well. That's your retirement money gone. For ever. Now you don't need to be a prophet to see that the economic downfall of Europe is inevitable, do you?
I agree with a great deal of your assessment. Canada is making the exact same mistake though, and the US has mass immigration from Mexico that I think Pres. Trump has only partially managed to reduce so far. So, you're left really with only Eastern European countries like Hungary and Poland and the Far East that are working against the tide. Even those countries have a lower than replacement birth rate but at least they are ready to defend their borders. (There is one tiny country I heard of, I don't know if it is a myth, where they follow a libertarian model I think, I forget the name). You may struggle to be let in to these countries but I don't know for sure, obviously as you point out skills are a big plus if you are going to try.
As far as your comment:
I question that we absolutely can't reverse it because there is no physical reason why we can't increase the birth rate, we simply have to discover the will to do so. I think current cultural norms are a factor in the low birth rate, and cultural norms are one thing you can change.
In a democracy where the majority are supported by the minority already, this may I agree be insurmountable at the ballot box, in which case an economic collapse is perhaps to be wished for because it will force change on society whether society wants it or not. I fear that an economic collapse may bring civil conflict in Europe because so many people who appear to be disposed to violence have been stupidly let in and are dependent on the state. Please don't misunderstand me I share your gloomy assessment of where we are heading if we don't change course, and change is becoming more difficult every day as the new arrivals will be able to vote before long, but I'm just not quite at the point of just writing the whole of the West off yet.
As for drinking beer and sharing ideas, well that is just what we're doing here - I see that as a little cause for hope as well. Crucially I believe we must start having these conversations now in earnest, otherwise there will be no hope of putting things right after the (probably inevitable) crisis. We must undermine and replace the mainstream media with truth telling media, but that is a process at least that has already begun. The difference between now and the past is that we have this fantastic means of communication now so the people who see what's coming can at least start to plan ahead and try to organize for the aftermath.