It is no coincidence that such a high percentage of unicorns are built on SaaS platforms. They enable speed to market. They allow the nimble company to navigate the unknowable. They disrupt customer relationships, lower costs and help keep the enterprise secure. SaaS models have been used to build some of highest-performing companies today and will undoubtedly be used to build the fabled unicorns of tomorrow.
For a further perspective on transitioning to SaaS, see the EY-Parthenon report Crossing the chasm: Lessons learned in transitioning to a SaaS business model.