Maybe nothing will happen.
Edit: to add some substance to this post, I want to be clear, I'm not predicting the markets will tank. I just don't know what will happen. Nobody does. It's unknowable. All anyone knows at this point is that the markets are very likely to tank at some point between now and August 2nd if a deal doesn't get done. What's more, everyone knows this is coming, so once it starts, it's hard to see how cooler heads will prevail. Any new development could trigger it -- or it could just happen, apropos of nothing.
In other words, it's going to be a very long, very nerve-wracking week.