I thought I needed it, I thought I had time to sit and wait on wildlife to do its thing, and I certainly don't do sports enough to warrant having a 7D. It's probably a bit too 'pro' for me.
My situation leads my to thinking that my 70-200 2.8L IS II would just so suit being on a FF camera. My future shoots include 3 weddings in the next year, events and parties. I feel the lens is being held back by the 7D's older sensor.
If the 7D is good at one thing, it is versatility. I doubt your clients will find the IQ lacking if you shoot their weddings well.
I'd look at adding a 2.8 zoom in the 17-5x range before looking at a new body if in your situation. If 2.8 is not enough and you're trying to go the available light route then perhaps a Sigma 30/1.4 or similar.