Replying to Canon 7D worth

So Ive been thinking about upgrading cameras. I bought my nikon d3100 a little over a year ago because it was a beginner dslr. I kinda feel as if I have done alot of which the camera has to offer in both filming and photography. This upcoming year im trying to start a digital photography class at my school, we only have regular film photography, and so I want to upgrade my camera. Is it worth selling my d3100 and buying a 7D body off ebay and then getting some good glass or should I think about something else? Really what im asking is the 7D a good enough camera for skiing fiming as well as regular photography for me to sell all my gear?
thanks