Once you get to a stage where your client is using 15gb bandwidth a week it defeats the purpose of having a p2p currency when you will be forced to use an online wallet which means your coins can be traced.
No alternative coins have features that reduce bandwidth usage. The only reason they are less bandwidth intensive is because less people are using them.
Donate to wikileaks from blockchain.info and receive a drone attack through your window
![Cool](https://bitcointalk.org/Smileys/default/cool.gif)
Bitcoin can be used anonymously if desired. Even blockchain.info wallets can be used through tor.
If bitcoin gets to this stage anyone who values financial privacy will not use it. So its good to have alternatives because using a thin client that relies on someone elses server isnt the answer.
No alternative coins are any different in terms of privacy than bitcoin is.