While it may seem so, in the sense that the dev has sort of abandoned the coin, it has still managed to remain stable on the markets, with a nice trading volume.

I sometimes wish that Primecoin could be expanded further, by improving its prime hashing algorithm, establishing wallets for mobile devices, and sorts of other exciting stuff. But as long as there is an active community supporting it, then it should survive for the long term.

Nevertheless, a unique cryptocurrency like this deserves some attention, as it delivers a truly innovative form of mining by solving prime chains. Just my opinion.