I'm undecided on Musk. As I alluded to in my second paragraph, I think it depends on whether you've got a team and a plan that's working out. Specifically:
First, it does seem that Musk has had a plan for at least two of those companies: Solar City and Tesla. It could still fail, but at least there is some plan and soon they will be one company.
Second, I think my opinion would also depend on the bench strength of the rest of the company's team as well the other leadership. Basically, these will be the people who will be there to make the important decisions and make sure your company hits its results while you are working on your other company(s). I haven't learned enough about Musk's team to have an opinion on that yet.
Finally, there is the question of the overall company vision/mission. I would say that Twitter's mission is under siege and in need of revisiting, far more than Musk's companies. This is can be confirmed by Twitter's consistently poor user growth numbers and feckless monetization efforts.
First, it does seem that Musk has had a plan for at least two of those companies: Solar City and Tesla. It could still fail, but at least there is some plan and soon they will be one company.
Second, I think my opinion would also depend on the bench strength of the rest of the company's team as well the other leadership. Basically, these will be the people who will be there to make the important decisions and make sure your company hits its results while you are working on your other company(s). I haven't learned enough about Musk's team to have an opinion on that yet.
Finally, there is the question of the overall company vision/mission. I would say that Twitter's mission is under siege and in need of revisiting, far more than Musk's companies. This is can be confirmed by Twitter's consistently poor user growth numbers and feckless monetization efforts.