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Serious question: what happens after? Will it literally be 'free energy'? And are we ready as a society to handle this properly? How do we ensure that this will benefit everyone and not create an enormous imbalance by itself?

I guess the existing economics will be broken at some point if the cost of everything will be driven down in such a way. Are there any articles/works that explore this issue?

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No, the cost structure of fusion is going to be much like fission: the cost of building the reactor has to be spread over time (with interest). Even though the fuel is cheap, you are (in a financial sense) 'burning' the reactor, which is expensive and must be bought up front. We don't know for sure how it will work out, but none of the predictions I've seen show fusion producing dramatically lower cost of electricity.

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