I've hoped for a long time that they'd open up their system as a re-usable tool. So many web sites are forced to create (very limited) web page builders because it's just too much effort to justify creating something as complete as Weebly is. I think a lot of companies would pay a nice monthly fee to be able to re-use Weebly's page builder on their site. I know I'd use it for some of my projects.
It's on my large List of Ideas To Do If No One Else Will.
This year it added a fourth teammate: Greg Dingle, who is working on a stealth online advertising project that Weebly plans to launch in the next few months.