This is a major point in favor of Flash. The adoption and expansion of Flash into the enterprise is critical to the future of Adobe. Thus, Adobe will continue

This is a major point in favor of Flash. The adoption and expansion of Flash into the enterprise is critical to the future of Adobe. Thus, Adobe will continue to invest heavily on improving and expanding the Flash player, API, support and development tools. Microsoft could drop Silverlight with little impact on the company -- it's not critical to the success of Windows at this point.