bullshit. Unless your pants are literally glued on tight (like levi 510s) its not going to be an issue. No one is going to care. Lots of guys (well, ok guys on here...) wear their dress pants tapered down to 7-7.5 or so. I'm tired of hearing this line repeated over and over by people. Only a very few jobs (banks maybe?) would be that strict, and usually the person worried about it is just worried about co-workers giving them shit for wearing "skinny pants" or some bs.
I actually do work in banking. Per the employee handbook, I am not allowed to have my ear pierced (I don't have my ear pierced but that just shows how conservative of a bank I work for)
As far as casual pants and jeans, 7 or 7.5 inch hem is exactly what I like. But professionally, I prefer a slightly different look. Most of my work pants are from H&M, so they are very slim fitting. Judging from the pictures on the Dockers website, those look even tighter. I could be completely wrong. I have actually never owned a pair of dockers period. But it's a moot point because I don't care for the colors anyway.