Comment by roncesvalles

Your "now what?" question is legitimate and reminiscent of reactions after the completion of the Human Genome Project.

Just like having a human genome sequence, this is not a magic key that solves all problems of biology but a building block for use by researchers. An investigator may look up the folded structure of a protein and use that information to glean certain context-specific insights from it such as how exactly two interacting proteins interact mechanically.

The other significant benefit is that this frees up resources that were spent having to figure out the structure in other ways. It's an efficiency improvement.