A bit surprised

I had my mid year review at work today.  It only took 12 minutes.  I got one added goal which wasn't bad since my boss got 3, of course I will help her with them but it is ultimately fall on her.  Then in a sort of surprise move she asked me if I would be interested in my boss's job.  She is leaving in Dec of 2012.  I told her I would be interested but we would have to talk about it at length.  I think the first thing would be talking salary.  Then we would need to define the job expectations.  One of the things I worry about is that our boss is also leaving in the near future.  I have a feeling her date may also be Dec 2012 but she isn't telling.  This is not a job I enjoy but I could do her work and we would have to hire someone to do mine.  The like to be very PC on who they hire.  I was a surprise as a white woman but apparently I was the most qualified.    I feel like there would be job security for at least 6 years maybe longer.  So do I really think about taking on the business associates job or do I keep looking for a different position?  They give a pretty good package when they have to let people go.  If I work until Jan 6th 2012 I will have a pension, small but a pension.  I think I'm going to keep looking but also keep deciding if I would like to do the job.  When I mentioned that I didn't know if I would like to be chewed up and spit out like they do my Boss at the meeting she said she didn't think that would be a problem for me.  Theresa is a bit forceful and I think that may cause her issues that I wouldn't have.  Who knows.