Medaka Box will be safe for awhile but if it continues being in the bottom there's a possibility of being cut like a certain little series called Ane Doki. Also here's a fun fact Jump magazine was one of the few publishers in japan that had an increase in subscription from readers. While its closest competitors sunday and shonen mag dropped. They clearly know what there doing when it comes to cancelling series, even if they sell well in tank they'll cancel it if it does bad in the rankings. Medaka ain't safe just because it's tank vol is selling good.
http://www.animenewsnetwork.com/news...lation-numbers