If you chose to use a different SOAP stack, perhaps as a servlet within one of your deployments, then it would not help.
I don't think in an ESB we should be restricting people to use one SOAP stack. Especially considering some people prefer the Spring + CXF stack. Or have legacy endpoints written in Axis. The whole point of an ESB is to integrate with many technologies. Considering legacy apps is one of the main drivers in ESB integrations in the field, it is not a viable solution to say "our ESB only works with JBossWS!"