Dave Megginson - Problem-first design:

"How many developers do you know who complain about working nights and weekends manually entering connection information for thousands of publicly available web services? Given that there are, at most, a few dozen sites offering web services over the public web (and that's web services in the most general sense, including REST as well as SOAP), I'll guess that the answer is 'zero'.

So here's my suggestion: let's hold off on designing new specifications until there's a real problem to solve."