I think the term "I think" can be both good and bad.  It depends on how it was used.  I don't like to use the term because I feel it's too tentative for certain questions, and doesn't make me look as compenent as I really am.  So I thik it depends on the context you used that phrase, and the interviewer.    For every position, I've been hired for, I hear within a few days of the project decision deadline.   Even if the interviewer is just telling me that the decision making process will take longer than anticipated.  When I don't hear anything either way, within a few days of the project decision making timeline, then I figure I haven't gotten the job.  

But, I'm almost always applying for multiple positions and I keep interviewing until I have a written offer and have accepted that offer.   I think the biggest mistake that anyone can make (and that I made when I was a new college grad) was interview and then stop the job search until I had heard from the organization I interviewed with.