> Either way, if you built a WebOS app then it won't run anywhere else today.

That's not very true. Any HTML5/JS app built for WebOS 3.0+ (when Mojo was depreciated, and Enyo brought in) can run in any browser; if it uses WebOS-specific API calls (most often used for notifications), then it can be wrapped in PhoneGap/Cordova and compiled for nearly any OS.