Sadly I see this as a way to devalue the amateur radio license, as it makes it possible to cheat. Anyone can open two browser windows or use two devices in order to obtain answers to questions. While online, if accessible, may be nice for us disabled folks, such testing comes with lots of issues such as:
1. Accessibility, will all potential test takers be able to use the site?
2. What about preventing folks from cheating?
3. And will this replace the VE and thus render them unnecessary?
Thus no I am not in favor of online testing.