Good thing you solved the botnet problem.  You are aware that some of the largest botnets have 250,000 computers each with dynamically changing IP addresses.  Plus each node is constantly looking for new nodes to infect.  Some nodes go "dark" (botnet lost control, computer taken offline) everyday and new nodes are added.

They aren't a single entity which is easily blocked.  If they were we would have no global issues from botnets (DDOS, spam, password hashing, etc).  The law enforcement division from half civilized countries in the world have cyber crime divisions and they haven't been able to make a dent in the problem.

If litecoin was every commercially viable it would be instantly destroyed at will or double, triple, qudruple spent into oblivion by a botnet operator.  Being GPU hostile it will never have the hashing power to withstand an attack from 10K, 50K, 250K+ computers hashing the block chain for malicious purposes.