Will this transition remove the ability to use Dwolla for withdrawals?
No. It is possible we'll have a small delay while we make sure we're comfortable with the Dwolla withdrawal API, we're still talking to the Dwolla folks right now. That said, we want to support Dwolla, and Dwolla wants to work with us, so I don't anticipate major changes. I agree that once you've got the accounts set up, the fees at Dwolla are rocking.