I think Primecoin has a good chance if more merchants start taking it as payment.

A have been looking for a simple way to take Primecoins as payments. However as it is now there is no easy way for me to stick a plugin or Primecoin payment system on my web stores.

I have thought about paying for development of such a system.

At this time I am not willing to invest a few thousand dollars needed to implement it. Hopefully someone with more practical experience will come up with a solution.