Were the Greeks certain to lose without intervention?

Were the Greeks losing so badly that only great-power intervention made independence possible?

They were losing then, but the likely duration and cohesion of the Ottoman-Egyptian effort remain uncertain.

The Greeks were losing at that moment, but final defeat was not automatic. Egyptian success in the Peloponnese did not guarantee that Muhammad Ali's interests would remain aligned with the Ottoman center. The later conflict between Egypt and the sultan shows why coalition cohesion cannot be projected indefinitely backward. Without the same European intervention, the war might therefore have changed into a more complex Ottoman-Egyptian-Greek struggle rather than ending cleanly.