I am a fan of EDA - Event Driven Architecture. I posted about it a bit here.
Its nice and all, but it is not without its problems. It certainly has a role to play in any architecture. But the last time I built one, I ran into some problems as detailed in my series linked to above.
Does SBA (Space Based Architecture) simplify things even more? For one thing, it minimizes "legacy" XML which is certainly a good thing. And the location transparency is mind boggling. Makes things like Sonic's shared subscriptions look quaint.
Just when you were happy that web services are finally dead, there is another shift. And if you are still talking about web services, well . . . sorry.