Currently there's a 600K PPS monster botnet herder out there collecting about 75% of the coins, that's why you're lucky to hit a block every three days with 5000-15000 PPS now.
Any CPU based coin will be owned by the Botnets as soon as any real profit can be made.
Sunny King better get a GPU miner developed pronto if he wants this to live very much longer.
For the record, I believe that Primecoin is the first truly innovative alt coin in a very long time.
~BCX~
Primecoin mining might be more difficult now, but I don't see how that kills the coin.