Some people I have spoken to recently have suggested that they are not convinced as yet that a SOA (Service Oriented Architecture) style architecture is correct for their organisation.
The major vendors are all promoting SOA and for better or for worse it is the architectural style that is being used for new projects. It may not necessarily be called SOA. But largely, if the architecture is not a 80s/90s style client/server model, then there will be a business tier that exposes services at some granularity to be consumed by a presentation tier or another business tier service.
So the main alternative for a SOA style architecture would be to more tightly couple the integration moving back to a 80s/90s style client/server model. Some organisations have still not moved from this model.