a coalition with PO
Under the right circumstances definitely. Besides the foaming-at-the-mouth libertines and the hard-nosed pro-capitalist contingent, there are still some decent, responsible conservatives in PO. Some go back to the Three Tenors whom Tusk disposed of to grasp total power.
However, my hypothesis envisaged only 3 parties in the Sejm. It is not inconceivable that SLD, Petru and maybe PSL (perhaps totalling 18%) will make it under the wire. A slim PO win would open opportunities for PO, but a slim PiS win would be disastrous to PiS. Again the size of the Kukiz vote might make the difference.