That's probably not exactly the right perspective. It's about empowering people who do not have the same skills. I don't think Weebly is aiming to replace the web developer: highly skilled people will always be in demand because they're inventing new things and pushing the boundaries on cutting-edge tech.

Weebly seems to be aimed at mainstream people who think "Boy, I should have website for my wedding/club/team/group/gaming clan." Of course, their goal is make that more and more empowering over time though. If you think about it, what you can do with Weebly was potentially difficult for the average web developer 10-15 years ago -- I'd say that's a leap! Before I started programming, I used front-page and dreamweaver to get started. Eventually, I got more sophisticated as I got more interested in building things but it was empowering to create a website without knowing HTML or CSS.