This is also a PGP application that most people can benefit from immediately (compared to using Hotmail), and one that can be used by even the most targeted users if their environment is set up correctly once the extension is out.
You don't even have that. From what I can tell, you have literally no argument at all; instead, you "agree" with the article while drawing exactly the opposite conclusion that the article draws, then point out again and again how much users don't want to install things, as if that changed the security of this system at all.
Scramble performed encryption on the server, then my argument is false. But the design of Scramble's protocol is such that the security of the application depends only on securing the client code, which I argue can be done, for those who set up their environment correctly.