Not needed. When capitalism melts down again, we call its bluff and take over. It can be done – with the right political will, the entire banking system of the UK could have been nationalised a couple of years ago. Capitalists have their capital taken from them because of their own fucking stupidity.
And, crucially, it does not have to be just an organised working class either. In terms of our relations to capital, most of us are in fact working class. Take me – university educated, working in a job that most would call middle class, but in terms of my actual wage and my relation to capital, I am at exactly the same level as a skilled manual worker, that is where my rational class interest lies.