Rim is staying here because of Security, Corporate accounts, email and BBM (plus a fear of switching). Droid is hear to stay because the power of google and the customization of the operating system. Apple is hear because of the media platform, apps platform, the hype, and the sleekness of their devices.
This is a world where windows can no longer compete. It's cheaper and easier to build a device for the Droid platform than anything else.