Your two paragraphs are logically irreconcilable. Obviously, they cannot legally or politically make a statement like "we will never get acquired." You tell them not to make that statement if they can't. But then you also tell them they should make the statement?

People need to chill. This looks like an awesome product and platform, and it doesn't seem like it will require any data lock in (you can always move your emails from place to place, and it looks like they won't necessarily even require you to store emails on their servers. Worst comes to worst, if they shut down, I imagine they would provide migration utilities.

These guys are clearly pretty smart. If someone is going to build this product, they seem like a good choice.