Multi-tenancy may be among the best examples of architecture-led marketing in the last few years.   

 

Multi-tenancy is a means to an end – re-architecting for multi-tenancy is non-trivial, and the resulting isolation is still incomplete - perhaps the multi-core/virtualization duo might end up winning this one…

 

<0.7 probability - call me when multi-tenancy hits the trough of disillusionment>