In 2013 most people didn't know about bitcoin. A big part of the spike in 2017 was from people who never heard about it before. Today everyone knows about bitcoin.
Why does it have to be the current version of Musk to be a better version of Musk? Why can't we consider that Musk or his type was instrumental to launch Tesla but at this point a different person is better fit to grow it? Maybe skills needed to sustain a company might be different than the skills needed to launch it.