Of course, during the interims, the other operators would have been in there trying to pick up business and routes but, as with MALEV, there is a market for national and full service airline
Is there are market? Yes, of course there is.
Is the market big enough to sustain a national carrier, or even a base operation from an existing full service provider, and for them to do so at a profit? Much less likely.
It goes down to the old saying - yes, there's a new gap in the market, but is there a market in the gap?
Switzerland is a completely different county compared to Hungary - far wealthier, and good demand for premium yields from three key cities - finance, biotech and much more in ZRH + hinterland, chemicals in Basel, ngos in GVA and the rest. Belgium has the eurocrats.
I'm sure the vultures will do very well out of the Malev demise, but I'm not sure they will leave many scraps for a network carrier to feed on.