worst case scenario??? there is no worst case scenario here, there is "I just didn't wanna study hard enough" scenario and in which case, yeh you might have a 2.7 GPA
Statistically speaking, students with low-ish GPAs (lower than 3.1 for example) have a harder time landing interviews.... no interviews = no acceptance (you get my point)
As far as post-bacc goes, the ONLY reason why someone would do post-bacc is to: A) take some upper level sciences, or B) the student is non-traditional and needs to take all the pre-reqs (me), or C) need to do damage control and boost undergrad GPA
So if you weren't working hard enough in undergrad, what makes you think your going to work harder in post-bacc?
Up to this point, I have about 190 credits in undergrad from 3 different universities (Detroit Mercy, MSU, & Oakland univ) and 1 community college and let me tell you something that is A FACT.... you will NEVER hear of a student who worked hard in undergrad and doesn't AT LEAST graduate with a 3.2+ GPA.... Undergrad education is not difficult, sure there is a sprinkle of hard professors here and there, but overall, not a difficult institute to do well in