I'm waiting, with baited breath.
When they come for me my response will be to delete everything and close down.
What's next? Facebook demanding $100 a year?
Why not, they have a captive market?
I'll bet there are a lot of owners of "free" software watching to see how it works out for Photobucket.
They won't charge you - you should be charging them, under FB's T&C's they own the rights on anything you put through their site, you don't own copyright on any of your data they can use it with impunity.