The problem of ‘growing big’ has to be solved via cooperatives operating in the same markets, not by disbanding the entire system.
That’s not a solution, though. Cooperatives within Capitalism are subject to the same rules as other firms, only without firm control of the state. These cooperatives will either grow or die, and you end up at the same necessary point, revolution and Socialism, or barbarism. Centralization is a fact of markets that sustain over a long period of time, ergo we should master those laws to make it as democratic and equitable a system as possible. In other words, Socialism.
My brother, I gave you a version of capitalism where workers globally own the means of production. We’ll even put measures against monopolization, labor exploitation, and short term profit seeking. Hell even add 100% taxation over a billion dollars so nobody gets too big. You’ll still won’t like it because it ain’t communism.
We won’t get to that fantasy land you described, so why bother creating it in our mind palaces? Utopia-building isn’t a useful form of analysis when describing how we get from A to B. You need to take ownership of the State for that to work, and end Capitalism to begin with.
With these measures, there won’t be a free market, which means the creation of value will be regulated. I don’t see why you would call it capitalism.