If we become immortal then the retirement age would be at around (∞-10) so none of us we'll ever go there and it will make the pension system not unsustainable but obsolete.
Depends.
Immortal doesn't necessarily mean "eternal youth". People die from either a pathological process, such as a disease or trauma, or from simply "old age", which is an accumulation over time of cell death, telomere depletion, DNA mutations, mitochondrial mutations, failure of cell mechanisms, accumulation of toxins, and so forth. Although we already have immortal human cells in labs all around the world (see
https://en.wikipedia.org/wiki/HeLa if you are interested), in terms of a person it is going to be far easier to cure "disease" than it will be to cure "old age". Long before we see immortality we will see average life spans increasing well above 100, and even if we ever do reach immortality, it is likely going to be far, far longer before we can maintain young, youthful bodies for a significant period of time. There will be far, far more elderly and retired people in the future.
Well, you can't achieve that without having a way of replacing or teaching the body how to generate new cells, at the same time teaching him it's not good to keep regenerating some others like the bone growth centers and if you manage that, yeah you're on the path to immortality.
But in my short to medium experience, seeing hundred of crushed, stabbed, burned and so on bodies in the emergency unit I'm willing to bet that immortality would come when we ditch this body and go to the full "ghost in the shell" scenario. Not that when eventually this might happen will be of any interest to us.
It will be untenable to continue to tax the ever decreasing number of workers more and more to pay for the ever increasing number of unemployed and retired. Given all this, the current economic model will be obsolete as you say. I won't profess to know what the answer is, but unless you don't care about widespread poverty, there will need to be a significant change.
The current model is obsolete because were reaching the limits of substantial growth.
Well, robots would help us make cheaper booze, but even if you manage to sell it at 1c/l you won't be able to sell more than 70 billions beers a day, right? Nor you will manage to sell more than 10 billion condoms. Of course, the numbers I put are overly exaggerated but you get my point, there is simply no more room for huge growth.
We've found out all the continents, we've managed to reduce the working hours from the full day to 8 hours, we almost nullified the time for chores with all the automatic cleaners/washing machines so on and on, at this point in order for us to do more stuff and use more services and generate growth we eithe have to ditch sleep or we must increase the population.
But, till when?
Even 3rd world countries are saying a reduction in births in areas with a better economy and with a better education.
It's not only Europeans that stopped having the 2.5 children, I had a co-worker from Morroco, he was 42 and had only a daughter, yet he told me he was from a family of six, the whole non-sense of giving birth to tens of children will soon stop even in Africa and India, people are starting to have fewer children in order to take better care of each of them, it's natural.
Sooner or later we will have to deal with zero economic growth or even worse, there is no way to avoid it.
There are plenty more, some even mentioned int he article, almost every EU country has one disguised under some other name, even us has the EITC.
But reading the article...
The average sum paid in January 2018 to GMI receivers was RON 277 (EUR 60)
I know that except the capital the prices are dirt cheap compared to Prague or Munchen but 60 euros? It's not covering even a monthly bus and bahn subscription.
How the hell are you supposed to feed yourself, forget clothing and washing with 2 euros a day?