There are 3 free implementations of WebGL, and I think Opera support is on the way. If there's a WebGL game that you want to play, you can install Opera, Chrome, Safari or Firefox.
As for mobile, neither Apple nor Microsoft will support it. Flash will be around for years, but platform support is on the wane.
By default, Safari does not support WebGL. With Safari 5.1, you need to enable the Develop menu in Safari's preferences and then select Develop > Enable WebGL.
As for mobile, neither Apple nor Microsoft will support it. Flash will be around for years, but platform support is on the wane.