I can think of other routes to try besides PRG-ORK which would lead to a competitor response and an inevitable fare war with the much larger and bigger-pocketed FR. Wizz is not a large airline, and needs to choose routes it can operate profitably, and fights that it can win without inflicting too much damage upon itself. W6 should instead be trying to take over as much of NE's prime routes and infrastructure as it possibly can
The European economy is struggling and the LCC business is in a consolidation phase, with the weaker players struggling. Now is not the time to go off doing things for a costly blaze of brash publicity