It is not capitalism per se that is the problem. The problem lies in how corporations are structured, as well as neo-liberal globalization.
But, the nature of capitalist competition itself leads to monopolies, globalisation, hierarchy, a growing disparity between rich and poor. All of this Marx predicted.
Marx considered capitalism progressive. One of the glaring failures of Marx's theories was his failure to perceive that the industrial capitalist mode of production itself was and is the core of the problem. But not all capitalist enterprise suffers from that because not all capitalist enterprise is necessarily industrial.
Competition, even in capitalism, is not necessarily a negative thing, either. For example, my point of view is "anti-capitalist", but not universally so. A certain amount of capitalism in an economy is necessary, it keeps people invigorated. Even the Buddha supported the notion of profitable investing.
Wheter you agree with anything else he says it appears he was right about that. Even if you don't think marxism is the solution, I don't think capitalism can be either. Just look.
Marxism has been an utter failure as a solution. Its primary successes all occurred prior to WWI.
If you think capitalism can be fixed... ok how? What do you think could be done that could solve this? Keynes is a step in the right direction. It was tried in Europe ... and is being torn to pieces before our eyes. Global capitalism continues to become more powerful everywhere.
It is not a question of fixing capitalism. We already have the means to control it, we simply need to be diligent about making sure that capitalism is properly regulated in ensure the healthy competition upon which it is based. For example, Obama administration's claim that this or that bank is too big to fail is utter nonsense. On the other hand, we need to guarantee small banks.
The fact of the matter is that we already have the means and understanding the balance the social good against the excesses of capitalism. The pity is that you Marxists spend all your time reading Marx, but he is really just tearing a page out of Smith and trying to merge that with Hegel. Marx is a remarkably unoriginal thinker, with a journalists mentality. You should read Smith, thoroughly. His concept of capitalism is really well thought out and socially as well as environmentally sound in many respects. He in fact would be horrified at the modern corporatocracies we are spawning today. He writes very scathingly of those who speculate in the stock market.
However, Smith's views are also unduly enthusiastic about the newly forming industrial economy, and he too, like Marx later, fails to see that the very means of production themselves drive economic forms of life and therefore, drives politics.
The Luddites understood this quite well, and revolted because of the destruction of cottage industries (which in part arose because of the shuttering of the commons on the 16th and 17th centuries, forced a lot of subsistence level farmers in the British Isles into the trades) that occurred as a result of the burgeoning textile mills.
One of the main points of Deep Ecological thinking is that how we make things is as important as what we make. Centralized production leads to centralized economies. Industrial production is summum bonum of centralized production.
If we want to change our politics, we must change our economy. If we want to change our economy, we must change how we manufacture what we need. If we want to change how we manufacture goods, we must in the end change ourselves.
The Marxist solution is bankrupt precisely because it proposes that all we need to change is our politics and policies, and then everything else will fall into place. This sadly, is the great shortcoming of the Green Parties, who have become little more than a retread of the old left, ala Social Ecology (Murray Bookchin), attempting to foster change at the policy level, rather than at the root, how we manufacture and produce what we use and eat.
I'm all for reforms of capitalism, but eventually all that gets torn down. At least that is Marx's prediction... what do we see?
If I were you, I would be more worried about the rise of Islam as a global political force.