In my post (8 days ago) about the future of Flash and Silverlight I mentioned that the one and only way to keep Flash/Silverlight relevant would be to allow a Flash/Silverlight file to be automatically converted into HTML5 for those platforms that don’t support Flash/Silverlight. Few days later, Adobe releases Wallaby.
I guess it is just a matter of time till Microsoft releases a similar tool for Silverlight. It would be the one and only rational path for keeping Silverlight a relevant tool in the long run.