Yes. The smartest implementations of SOA should - Just do it.
It's inevitable next-step in IT. Whether a company likes it or not, if their architecture is not SOA in this year, it will deemed to be outdated and still lurking in past. As a consultant I would not rate high an organization that hasn't started implementing SOA already.
Like it or not, the first steps in SOA implementation is all about web services. In most of the Fotune 500 and like-minded but not-so-fortune companies, should have started exposing webservices to one-another.
