You can have as many ontologies as you want to have, but you cannot have a single governing body. I like the HP description of the vocabularity. The market will determine which vocabulary is the most efficient. There are situations when that kind of negotiation won't work. I am not saying that everything should be conceived for disconnected scenarios, but those scenarios have to be taken into account.
Web services are horizontal, and other technologies are attacking more vertical problems.
Applying workflow to Web services require being very precise about boundaries. Hence you need flexible transaction models for service orchestration to work. TP has been out there for about 18 months and people have looked at it already. In the user community of the Web, the bottom-up approach is more likely to work. Adding 4 of 5 things at once is not a good idea, regardless of the number of people.