To answer the OP, no, capitalism is not failing. Without more context, failure can truly only mean existence as a system. Capitalism, at its root, is simply the free transactions of people of their goods and services by a common currency (as opposed to simple barter; because capitalism requires price theory which is not possible without common currency).
There should be a sticky on this board so we can all have common definitions and some rigor to our arguments. Yes, there are regional differences in application, but these discussions often grind down into political goring which does not help the discussion and at worse just reinforces bubbles of thought and cognitive dissonance. That being said, as someone who studied these subjects, let’s use the following key definitions:
Capitalism: an economic system of generally (and preferably) free markets transacted via currency, minimum government intervention, private ownership of the means of production.
Socialism: an economic and social system by where the state owns the means of production and has regular/periodic intervention into the market; decision-making for the populace as well as its industries are largely made through a type of leadership or council and such decisions are made through politicking/arguing as opposed to a completion of a sale for a good or service.
Social Democracy: a political system by which its citizenry vote in some fashion to provide a varying scale of social safety net type rights to its citizens, with a free market capitalist economy. The rights are paid for through less progressive, flatter taxes, across the entire populace. The most lauded examples of social democracies at work are closer to ideally free markets and the rights of the citizenry do not interfere with that.
Yes, there is some overlap, but these definitions should be used through a lens of reasonableness. For instance, an economy can be capitalist, but still have socialistic aspects, e.g. social security. A social democracy can have, and largely does have, a free market economy. A social democracy can have its industries self-regulated by a workers and owners council, where the difference lies in the degree of freedom and control. An economy where the means of productions and markets can be co-opted by government fiat is nothing but socialist at the end of the day.