While that is a beautiful Armenia, I think it would have to take a major genocide of turks for such a state to exist. In fact I can't imagine there being enough Armenians in that state to defend those borders even if the turks were totally "dealt with". Greece would love to have such a giant Armenia though, I bet they could work out some deals regarding the Turkish rump state(really hoping it doesn't get so bad that there is no Turkish state), and Pontic greeks could have their rights guaranteed and stuff.
Realistically I can't see such an Armenia existing. The best they can hope for is continued Russian success in war, and them being made into a Russian proxy state, that basically acts as their enforcer in the near east. Later improving relations with the Greeks, and combined being able to take down the turks on two fronts. The limits of such a state would probably resemble the Classical Armenian kingdom. I don't see a way for lower Armenia to join that, especially as it would limit the turks to just the central Anatolian plateau and I'm not sure if that is a viable state when there is a hostile Greece on one side and a hostile Armenia on the other.
Realistically I can't see such an Armenia existing. The best they can hope for is continued Russian success in war, and them being made into a Russian proxy state, that basically acts as their enforcer in the near east. Later improving relations with the Greeks, and combined being able to take down the turks on two fronts. The limits of such a state would probably resemble the Classical Armenian kingdom. I don't see a way for lower Armenia to join that, especially as it would limit the turks to just the central Anatolian plateau and I'm not sure if that is a viable state when there is a hostile Greece on one side and a hostile Armenia on the other.