There is a leader with a strong vision sure, but how long will he stick with it? We’ve seen him completely abandon a few projects now.

The previous projects were simply hobbies. This one has a full non-profit behind it. In the end though, there is always a risk. Then you need to hope that there is also enough development of secondary leaders who can carry the torch. It is more likely when people are employed under an organization with a clear goal. Mozilla and Servo lacked this goal and vision.