Just wanted to poll the opinions out there.  When should you got to grad school in the humanities/social sciences if you're not 100% sure you want to be a professor. 
 
My scenario: 
 
...I have a fairly lucrative "business" job that I like okay, but I am currently completely exhausted from long hours and travel.  I have always wanted to get a PhD and always thought that I eventually wanted to teach.  I am no longer sure, but I think that I would love graduate school.   
 
I only applied to a couple places, and I only got in to one--Harvard.  I visited and the people are great, the program is great, the funding is good.  But a PhD is a big commitment.  That said, there is no guarantee that I would get in again in a year or two.  I am probably going to accept.   
 
Thoughts?