For what Marx predicted about the future of capitalism, first and foremost, was the spread and dominance of the market. More than this, capitalism would expand to reach to every corner of the globe in the search for profits, slipping out of the nation-state's grasp and forcing every country to adopt its way of life. In place of the cornerstone of the American welfare state, Aid to Families with Dependent Children, we have now the Personal Responsibility Act. Find a job. Here's a voucher, go talk to the private sector.
Competition leads to the generalization of technological innovations, rates of profit decline.
Somebody has to make up for the losses and it sure isn't going to be the stockholders. You can find descriptions of contemporary capitalism like this in the business section of any major newspaper. Or you can find them in Marx. But whereas Weber saw market capitalism as inseparably linked to a broad, totalizing, rationalization of society, what Marx recognized about the market was its irrationality. Marx, however, foresaw a slightly less benign result to this process than did Smith.