Syriza victory: Turning point for EU?

This was an extraordinary victory for the radical left in Greece - probably beyond its own expectations. Alexis Tsipras will now try to lead an anti-austerity revolution, backed by a strong democratic mandate. He said in his victory speech that he is willing to negotiate with Greece's European partners. The question is: how much are they prepared to compromise with him?
Syriza wants to reverse cuts in public services and increase salaries and pensions again. It wants to write off a large chunk of Greece's huge public debt, most of which it now owes to other governments in the eurozone.
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Link to BBC