This would be an utter disaster from the perspective of Armenians and Greeks.
Turkey already got very favorable borders in 1923. Their claims to Western Armenia, Eastern Thrace, and Kurdistan were on shaky ground, and they still got them. This thread is like asking "How would Germany have turned out if they conquered Warsaw and Paris and kept them for decades?"
Long story short, this would lead to Armenians becoming a diaspora only, primarily in Christian Western countries, which means that they would intermarry and assimilate out of existence within a few generations.
Religion is the biggest barrier to assimilation, far more than other things like language or culture. Notice how most 3rd-generation Muslim immigrants (i.e. grandchildren of the original immigrants) in Western countries usually still have Middle Eastern-sounding given names like "Mohammed" and "Rashid", and still only have ancestry from one area, whereas most 3rd-generation Christian immigrants usually have Western/Anglo-sounding names like "Edward" or "Catherine" and usually have ancestry from multiple countries.
So if Turkey annexes all of Armenia, all Armenians that survived the genocide will either be forcibly Turkicized (like the ones left in OTL Turkey) or go to the west and become assimilated with the natives of those countries (like modern Armenian-Americans - most of the younger ones don't speak Armenian and have other ancestries)
So Armenians would effectively cease to exist as a people if this Turkowank had actually happened.
Thank God this scenario never became reality.
PS: For Armenians to actually survive this Turkowank as a cultural group, there are a couple of options, all of which are unlikely
1. Ottomans/Turkey not genocidal towards them: Requires a POD before WWI, but more likely before the late 1800s. Then they'd be like OTL's Kurds: A large minority in Turkey that's the majority in the Eastern parts of the country.
2. Armenian exiles from this Superturkey head to a country that isn't mostly Christian (India and China are the best possibilities)
Possibly some other conditions could enable an Armenian cultural survival in the case of this bloated Turkey