It's not just about hiding a transaction, though. It's about the larger question of privacy in the context of a public, transparent blockchain. In some ways, Bitcoin is so transparent that it works right into regulators' and law enforcement's hands. Sure, you can hide transactions now.

But with the speed at which blockchain analysis companies are developing and given that governments now seem very interested in cryptocurrencies, I don't think it will be so easy in the future. Not unless Bitcoin develops significantly better privacy features, like sidechains/drivechains that use CT, the Lightning Network, Tumblebit, etc. Law enforcement watches the centralized mixers closely (if they aren't running some themselves), and they run lots of TOR exit nodes, too. We need much better privacy technology.