Social Liberalism came about as a response to Classical Liberalism creating the same oligarchic problem you just described.
If it happened once, it could happen again.
I don’t know if it will, but its certainly possible.
Things don’t just happen randomly, systems evolve according to the rules society agrees on. In order for things to change, an iconoclasm has to happen first. Then a new set of rules will be created, and that will no longer be liberalism because that’s the ideology that will be cast aside in the process.
You keep saying Liberalism as if its only one thing. I’ve already mentioned three economic philosophies, each creating their own new set of rules. I’m honestly not sure we’re talking about the same thing.
The context of discussion was whether the current stage of neoliberalism can revert back to some other form. And my point is that there is no path back within the liberal framework. A different economic philosophy that will succeed neoliberalism will not be based on the idea of private ownership.