Unless you are actively for killing people once they hit a certain age, demographic collapse is a real problem. You cannot care for the elderly with nothing but robots. Elders need healthcare. They need people in general and unlike young people they don't move from dead rotting towns. In demographic collapse they don't even have anyone to make them because they don't have kids.

See Japan for how demographic collapse is working out. Young people are being crushed by the weight of what it takes to care for too many old people. And the cycle is only getting worse because of course young people don't have kids when very stressed. Japan has whole towns going to rot. They're economy is experiencing negative effects from not having the expected amount of workers for what they need.

You really want a gradually declining population. You want your birth rate to be about 2. 2.1 is the replacement rate. Currently the US is the only developed country doing this and mostly by accident due to immigration. The US is experiencing a much less pronounced pension crisis than other developed nations. Instead we can focus exclusively on our fascist regime bid for power. That's our of population decline as well, but we get to fight against it since the US is fairly balanced in demographics (for now. It remains to be seen how the millennial generation will handle being dominant generation in a decade or so)

The wealthy require a functioning economy to continue to be wealthy. A functioning economy requires that there be enough money being spent. People can't spend money if they don't have jobs. The wealthy will ensure people will have jobs. They might not be great jobs and people might be treated like shit, but there will be jobs. There might be periods where there is vast unemployment, but those periods never last long.

Go ahead, see how many cashier openings there are at your nearest Walmart.

Go ahead, see how many cooper(barrel maker) or elevator operator openings there are. Before the invention of the ICE there used to be an incredible number of people involved in farming because it is super labor intensive from start to finish. It used to be one of the primary employment source for a majority of the country, the world even. Now one farmer can till, plant, and harvest hundreds to thousands of acres all by their self. all thanks to technology. Once it took tens of people to till fields, then some stone age genius invented the plow. So it took a handful of people to pull and direct the plow. Then someone realized they could hook animals up instead of using other people. Jobs are constantly disappearing and being replaced with new types of jobs. Your point is moot, as history has proved time and again.