Security. Portability. Privacy. Reliability. All of these are issues that present problems (non-insurmountable in the long run, but problematic in the short to

Security. Portability. Privacy. Reliability. All of these are issues that present problems (non-insurmountable in the long run, but problematic in the short to mid-term). Fundamentally, I'd argue that many users prefer to have their apps and data locally, at the moment. In many cases, this is due to government or industry regulation – millions of HIPAA covered users/researchers will likely not move their data/apps into the cloud. With the growing trade of industrial espionage and intellectual property theft, I fully expect that many companies will continue to be reluctant to put their data anywhere that will make it less secure. Similarly, there will continue to be users who want to work in places where they do not have continuous or fast network connectivity (planes, trains, automobiles, boats, etc.) Unless browser-based apps can offer local data storage and offline functionality, I'd argue that we're at least a decade away from such a mass migration to online services.