The prince is a realist. There is zero desire for a monarchy. Even when Greece was rocking on its fundaments, the country looking into an abyss, when bankruptcy was as a Damocles' sword above them and the state into a complete standstill, even in this deepest crisis there was no call to overturn the dysfunctional republic and go back to "better times", to go back to the King.
If even in such circumstances there is zero appetite to get the royal family back, then Pavlos probably makes the realistic assessment: there is no future for a monarchy. He is wise to look after his own interests. He has to make a living, after all.