The debt burden increased significantly due to the weakening of the forint-euro exchange rate and the strengthening of the Swiss franc. The currency mismatch on private sector balance sheets took years to build up and cannot be undone easily. There is no simple way of converting foreign currency debt to domestic currency debt.
If government takes over, it would only mean a transfer of risks, but not elimination. If the conversion would take place directly and en masse on the foreign exchange market, this would almost certainly imply large exchange rate depreciation and possibly other unintended consequences.