I'm with this. I am going to be graduating with a crapload of debt (250k+). However, this has little to no effect on what my interests are. I have never had any interest in family medicine primarily because I dislike outpatient work, and I like research and want an academic career (which, incidentally pays less). Currently, based on how the rest of my med school career goes, I'm deciding between a high paying specialty in which I would pursue an uncompetitive fellowship that would actually decrease my income, or IM, where I would specialize but in an area that is not known to pay handsomely (though I've heard reimbursements are increasing in my area of interest and there's a whole lot of demand, unlike most specialties).
When I came to medical school I thought long and hard about the financial sacrifice I would be making, but in my position it made sense. I have no intention of ever having kids (may or may not get married, but financially that isn't a big deal if spouse is making their own money), and am the type of person who doesn't really see myself having a house with a white picket fence, I'm fine with apt/condo living. So given that, I felt taking out a student loan as big as a mortgage made sense as long as it gave me an interesting and most of all, stable, career. There are a lot of fields in medicine that I wouldn't call 'stable' right now, but fortunately, the field I'm interested in is growing with lots of job opportunities, and I'm flexible to live most places in the country.
Okay, that was long winded, but in the end, don't come to medical school with tons of debt expecting to get derm or plastic surgery. First off, there's always a chance your grades will force you into a 'lower paying' specialty (may or may not be FP, there are other options), and secondly, nothing is guaranteed income wise in the future with all the health care changes.