Example with a context (Forget Tanks. Russia’s Ruble Is Conquering Eastern Ukraine):
“The increasing use of the ruble is yet another sign Russia’s going to keep de facto sovereignty over the territory it and the separatists control,” said Cliff Kupchan, Eurasia Group chairman in New York. “If the sides implement the latest truce, which is unlikely, perhaps both the hryvnia and the ruble will be used. If not, it will be all ruble.”
Why do you think there is not any kind of article in front of ruble? Why not say it will be all the ruble?