Thanks for answering. I would like to clear a few things.
There's a few reasons 'why not do something like blockchain.info':
Blockchain.info does have access to your wallet. You get all of your information from Blockchain.info's central servers. They could do a lot of things, like make you sign outputs to their addresses, make up transactions that were never transmitted, and if you use their API they have your private key already. Not to mention they can include malicious JS.
Are you talking about, when we create a wallet .. they are the one generating all this for us? How about if we rather create an account offline, and then add it to BlockChain.info?
Features like mixing require control of private keys as well as off chain transaction. It's possible to use Inputs.io in a way that limits your counterparty risk to just that we won't double spend.
What if we don't want to use mixer? Do you provide an option to opt-out, and get full control over your account.
We have redundancy plans (aka 'dead man's switch'), both automated and manual. This isn't just for seizes / etc, the hot pocket will dump all coins in secure storage if it detects an intrusion.
My question is can we move to other services if we want to? and can we add externally generated wallets? Something like an import/export feature.