It seems Patriarchs do not become Popes, but Cardinals do.
Prediction: Patriarch Sviatoslav will be Pope some day.
While I understand your Urainian pride, I would place your prediction as being somewhat more likely than the New York Jets winning the Super Bowl this season and less likely than the Greeks recapturing Constantinople.
That isn't to say it could not happen, but honestly - I doubt it.
I, too, believe that His Beatitude will become Pope and I am not even Ukrainian.

In fact, I have been saying that since His Beatitude was elected patriarch.
I think he has many good qualities in his favor to his becoming Pope-not to mention that he knows about nine languages!!!
Did anyone foresee a Slavic Pope in 1978?
Isn't it then entirely possible that there can be another Slavic Pope, especially from a Church which suffered so much for its fidelity to the See of Peter? What a great testament that would be!