The Fear of Passion

Is it a risk not to have a Plan B?  What if I've been so focused on Plan A, the thing I am most passionate about, that not reaching that goal was never an option?  At what point do you say that enough is enough and it's time to move on?  Is there such a thing as moving on if it's the one thing in your gut that you know you were meant to do?

A goal without a timeline is just a dream. 

So how do I create a timeline?  How am I supposed to put an expiration date on my goal?  Would it be more brave for me to say "Ok, I tried.  I have to move on" or to keep on keepin' on?  

That is the fear of passion.  And the worst part?  No right answer.