Et tu, Brute
what I think, is that the likes of Gehry, Libeskind, Koolhaas and other 'big named architects' having created a very recogniseable form of expression - have basically had to go and trawl about the globe looking for nice old urban settings into which to place there designed objects.
I.e. That the big named architects really do subsist upon that nice prime corner site, on a grand old river, in an historic old urban context, somewhere in Europe or elsewhere, to really become the most fitting 'mantlepiece' for one of their cool looking hand made presentation models.
We as cities around Europe and elsewhere have facilitated these architects with very nice 'mature sites' to build these objects on. You will find a lot less going in the opposite direction, (Europe to America) except perhaps Zaha Hadid attempting to build in Cinncinati city centre or something.
Which is really a 'second prize' for someone who is quite a good architect, but has to travel around the 'hinterlands' and remote outposts of the architectural world in search of things/places to build.
Not discounting that Cinncinati were glad to get a profiled public figure such as Hadid to build in their city - I compare the situation in modern architecture at the moment, to when 'gladiators' were banned in Rome - in the film after that same name.
Architects like Zaha Hadid in that sense have become the 'Russel Crowe Maximus' characters of the empire - striped of their former ranks and busy fighting scraps in the remote colonies of civilisation just to stay alive, without a fitting stage for their talents.
I am thinking here in terms of the Cardiff competition etc, etc, etc. If that had been built, would the world of architecture now be a very different place? Recent signs like the Cairo project are promising I think.