What "innovations" has Nikon brought to the table recently? Technology is pretty good these days. If people switch systems every time the competition has a marginally better spec'd product on paper... you'll be spending a LOT of time and money switching back and forth rather than taking photos.
as much as I love canon, Nikon has their great products as well. I honestly have no hate, and both excel in their tasks. Some nikons may be better and some canon may be better, but if you seem that invested and with such great gear, not unless you are pouring cash out of your nose, then i dunno. Seems like such a waste of money. maybe if this was the case if you had a rebel or a D40, then switching to either company may be easier... or maybe have both? I dunno.
what I do agree with though are the prices canon sometimes have for their products, despite that they may be great products, sometimes overpriced and canon (this goes for you as well nikon) go hand in hand.
great opinion, but I feel that there seems to be too much negativity in your thinking. and with all the gear you have, producing great work isnt all in the camera itself.