I can't get to the pics either (Geocities has a max of 3 megabytes
transfer per hour).

Assuming this is more than a trivial dip:

I'd wanna know who said it wouldn't get any worse and what they base
that on. You could have a cracked rafter (only seen one of those
ever), and I'd rather jack it up and fix what's wrong than have the
dip. It cannot get better on its own, only worse, and when you go to
sell eventually, any potential buyer will either be put off by it or
make you fix it.