Are Malev shelving the route or suspending it for a few months?
I understand they may be operating some ski charters and the aircraft has to come from somewhere. Could the flight be returning when the ski season is over?
If it is being shelved, I guess that despite the good loads, they're just not picking up the business passengers. Malev are still operating on a traditional model, so filling up economy is not adequate on its own.
I'm sure someone would pick up the route, so it's the loss of connections that would be worst. One immediate family member has used them to get to Athens a few times and certainly rated the experience better than BA through Heathrow or KLM through Amsterdam.