Bitcoin is still qualified as experimental. Going to mainstream right now would be dangerous.
https://bitcointalk.org/index.php?topic=921669.0You can't expect to people to use bitcoin without understading how it works. A lot of people already do this, and see what happens. A common mistake is leaving the bitcoins on exchanges or in other services where you don't own the private keys. Another situation which clealy shows Bitcoin still can't go to mainstream you can found in this thread:
https://bitcointalk.org/index.php?topic=931351.0 (the issue here is not about the MultiBit bug, but about OP doesn't understanding about software licenses).