Aegean were quick off the mark
to swoop on BUD when Malev collapsed.
Unless there is some reason why AMS-ATH traffic has totally collapsed, then I'm sure Aegean will sit up and take notice at this drastic cut on this particular route. Given that they currently operate 12 flights weekly between BRU and ATH (though I have no idea what their summer schedule is like!), then perhaps they could make a stab at it...