A great article of future of cloud IDEs: The Cloud IDE and its impact on DevOps by Chris Riley (@HoardingInfo). The article makes a number of excellent points. Many developers will oppose the Cloud IDE without much consideration.
These are all very good points. From my personal experience, developers are very picky, they don’t like change, and they don’t like someone telling them to use some new cloud IDE. The offline issue used to be a sticking point but nowadays it’s becoming pretty difficult to find a place without internet. If no internet or WiFi is available, people can get online by tethering their mobile devices or via MiFi devices. Many airlines offer or installing WiFi on their planes.