> The underlying technology is valuable and the problems it may have today can be overcome.

I'm pretty sure that's been said about email and its encryption/validation problem. And while it's still used, other products have come in and eaten its biggest market - asynchronous communication.

Inertia's a bitch, and when you have millions of users, you can't change things willy-nilly. At least, not if you want the product to be viewed as legitimate.