While most people want Bitcoin to replace the US dollar, I think that as a secure, decentralized payment method, it's more useful as an alternative to Paypal. Like everything else, it's usefulness is tied to the number of people who adopt it.

Do you use cash in real life to avoid telling companies what you spend, where you spent and what you spent it on? If your answer is no, then you probably won't find much value in doing the same online with bitcoins.

Nope... but I also never deposited the cash I earned under the table :-)