It is useful to consider, however, some of the reasons why companies are moving to SaaS, since these are true for BPM as it becomes available in a SaaS environment:
Have you considered SaaS from a standpoint of legal and business practicalities? By using a SaaS solution, you effectively outsource part of your IT and in some cases, business processes, which were previously managed internally.
Large-enterprise deployments of SaaS will not only touch internal business processes at multiple points in a few short years, according to Gartner Inc., but they will also be deeply intertwined with business process management systems (BPMS) in ways you might not expect.