I believe you will always be able to make html5 apps if you want. But I believe the iOS 'apps' model is going to become the standard for consumer pc's. This will cause native apps to no longer be second class citizens, and HTML based apps will have to compete with native just like they do on iOS. Right now basically all consumer computing happens through the browser, except for ms office, and it takes enormous effort to get a non-technical user to install software.