That is a good summation of the advantages the D300s has over the D7100 - almost none of which are critical for all but a few specialized types of photography. BTW, if you're firing off longer than 4-6 frame bursts of sports shots, then you aren't shooting, you're just hoping. I think long bursts may be more appropriate for aviation, and perhaps wildlife, but I don't shoot either, so I can't comment on that.
That said, I can think of one other critical question to ask, when comparing the two cameras: Do you have another pro-form-factor body that you regularly switch between? If you use a D3/D4/D700/D800 body, and switch between that and your DX body, I can see where having the same control layout is a real advantage. If you aren't switching, then you can adapt your technique to the D7100 control layout, which is very good (yes, including finding a work-around for the lack of an AF-On button). But, if you are using two bodies with different controls, then that can be a major PITA.
That is why I like the control layout of the D600. A lot of D600 users will be upgrading from/switching between the D7000/D7100 and the D600/D610. The transition is seamless. But, the transition from a D4/D800 to a D7100 can be far less so.