WebOS also didn't have a really sustainable app development structure. All of the apps were basically just webapps wrapped in a container, so the sorts of things you can do on an iPhone or Android would never work.
What I would have liked to see happen is HP leverage the fact that Android and WebOS were linux and port the interface over to Android with the WebOS interface and create their own fork, sort of like Amazon did with the Fire tablets. They'd have had access to the app ecosystem and been able to create unique devices while attracting guys like me away from iOS. BlackBerry went that route but it was several years too late by that point.