Linkbait headline. As this article itself (last line) alludes to, production of plutonium-238 has restarted[0]. So we have enough for three more batteries, but are producing more...
[0] http://www.popsci.com/science/article/2013-03/first-time-col...
[0] http://www.popsci.com/science/article/2013-03/first-time-col...