–full automation of production: all mass-produced goods can be made by robots and other industrial machines, and that includes the robots and industrial machines themselves. So robot factories become self-replicating, a capitalist who can afford one robot factory can program it to build copies of itself for no costs other than raw materials, energy, and land.
–As a result it's impossible for capitalists to make any significant profit from manufacturing; in Marx's terms this is because there is no surplus labor to exploit, but another way of putting it is that if it costs the capitalists nothing more than the price raw materials and energy to replicate any given good, then market competition will drive the price of the goods down to little more than the raw materials and energy that went into them.
–One way around this is to have an artificial monopoly on a given type of good via intellectual property laws, then you don't have competition and can set the price to whatever you want (although there may be close-enough knockoffs, like iphones vs. androids). And even in that case, the only profit comes from owning the intellectual property itself, there's no advantage to capitalists of owning the factories that make the product as opposed to just something like patenting a product design and then outsourcing production. So, capitalism adapts by specializing pretty much exclusively in the creation of intellectual property, like product designs or software or entertainment. The robot factories are either a kind of public utility, or they are still owned by "private" companies but these companies depend on government subsidies to stay afloat and are so heavily regulated that it's not much different in practice from the government owning the factories outright.
–And incidentally, ultra-cheap production of solar panels and CO2-absorbing machines helps us avoid climate disaster
–The combination of cheap robot-made goods and there not being enough good jobs to go around due to automation creates strong political pressure for a universal basic income. And because of the cheapness of most goods, the necessary tax rate on people who do still have high-paying jobs is a lot lower than it would be today, so there isn't that much pushback from the porkies, it's a better deal for them than having to deal with the constant risk of uprisings by unemployed masses.
–Since workers don't need to own expensive means of production to be involved in the creation of intellectual property (a programmer can work on his home computer for example), and also don't need a regular salary to avoid poverty (a programmer can work for years on designing some new software even if no money will be made on it until it's done), over time more and more workers prefer to get shares of profits on whatever they help create, instead of working for a salary.
–So gradually you get an erosion in the concentration of capital in the hands of capitalists who pay others to make things they sell for a profit, and the system evolves into something resembling market socialism.
–Eventually, with self-replicating robots mining asteroids and shit, there's so much abundance that more and more workers don't even bother asking for either salaries or profits, but just work on freeware projects. Their motives would be some combination of wanting the creative satisfaction or working on something they like, and wanting the social status you get from having contributed to something popular. Fully Automated Luxury Communism achieved.
