I think we will see more 51% attacks on the smaller coins in coming weeks. If it can happen to feathercoin, it can happen to many others as well.
It can happen to
any coin. Still.
Feathercoin is the biggest one after Litecoin. Feathercoin has 1320 MH/s. Next biggest coin is Worldcoin with 700 MH/s.
It worked for Feathercoin (OK, at a little lower network hashrate), Worldcoin would be an easy target.
Step by step guide:
1. Build up a hashing farm.
2. DDOS the 2-3 biggest pools.
3. Take over the network.
Will soon work for Litecoin. Would also work for Bitcoin (take down BTC Guild and 50BTC -> 45% of the hashing power gone).