The New York Times recently lit up the Japanese Twittersphere with a cartoon that was a little too accurate for comfort. In it, a stretcher marked "economy" is loaded into an ambulance with "Abenomics" painted on the side; the vehicle lacks tires and sits atop cinder blocks. Prime Minister Shinzo Abe looks on nervously, holding an IV bag.

The image aptly sums up Japan's failure to gain traction in its push to end deflation. The Bank of Japan's unprecedented stimulus and Abe's pro-growth reforms have yet to spur a recovery in inflation and gross domestic product growth, and the country is yet again in recession. Worse, BOJ Governor Haruhiko Kuroda is rapidly running out of weapons in his battle to eradicate Japan's "deflationary mindset."

Minutes from the central bank's Oct. 31 board meeting, at which officials surprised the world by expanding an already massive quantitative-easing program, show that Kuroda now has a budding mutiny on his hands. Many of his staffers think the central bank has already gone too far to weaken the yen and buy virtually every bond in sight. That's a problem for Kuroda and Abe in two ways.