Actually, I don’t know what’s worse for Greece. Ideally, they have a “vivid” debate on re-population by other cultures. But in reality, they will simply jail the side that has a problem with re-population.
So it leaves it to people that have nothing to lose, and that results in violence and lots a bloodshed.
But the alternative...becoming like Lebanon in the 1980s (a fairly even mix of Muslims and Christians), and then descending from there to be a Muslim-only state - that also doesn’t sound to good.
But, most likely, the new majority there will simply invite Turkey in and ask to be a province. And then Greece, as it has been know for millennia, will simply CEASE TO EXIST.
I think Greece will eventually vote to join Russia for protection, since they are both Orthodox.