Disclaimer: I didn't read the full article. I can't stomach these types of "career strategy" articles anymore. This approach to life in general is very misguided (maybe less so if you just want a career to fulfill other goals), but for those who want to pursue a more idealistic life, just pursue your passions. Plan B is being an improv comedian. Plan B is writing the great American novel. Plan B is traveling the world as a war correspondent.
I left corporate world precisely because I felt "planning my career", as I was encouraged to do, was an absolute false way to live (for me). I couldn't reconcile the absurdity of it with the severity of the consequences if I didn't do it. But the consequences are all socially constructed, and they go away as soon as you change your mentality.
When I think of my heroes, I don't think of people who've hedged their bets here or there - they just did what they felt they had to.