Still practically none of (web) cloud apps have the level of usability available in desktop apps. Even though HTML has come a long way, I doubt it will ever catch up. Imho the next trend will be native apps with integrated interfaces to cloud services. These kind of applications have existed for a long time, but they were not widespread. Now however with the advent of app stores it's becoming mainstream. Pretty much every serious cloud service already has a native mobile application. Why not do the same for the desktop?