Thank you all for your input. The faster frame rate is what is attracting me. But the smaller megapixels has me wondering about image quality if I do crop. BackdoorHippie I too do mainly wildlife. Humming birds and backyard animals, deer, squirrels, etc. If I can get a good trade in allowance for my D7200 I may look at upgrading. Do you have an XQD card or the SD.. XQD cards are very pricey and hard to find.. Thanks again for all your help. Keep the comments coming..
I have both the D7200 and D500. For me, the D500 is worth the money. Don't worry about a slightly lower resolution, the IQ is equal to or slightly better than the D7200 for me. The autofocus is noticeably faster and more accurate. Of course, you still have to do your job and put the focus point where it belongs.
XQD cards are a little more expensive, but once you see how they are built, you'll understand part of the reason for the higher cost. SD cards are always a little on the flimsy side, and the XQD is very sturdy, and the contacts aren't exposed and possibly bent or broken as on SD cards. Also, of course, they are faster than an SD card.
The frame rate is great for things like birds in flight. I get twice as many shots to pick from, and probably twice as many keepers, as with the D7200.
I know many people feel that the buffer size and frame rate are not something they need or want. But, I'm willing to bet that a fair amount of people would not only find it useful, but would not want to give it up once they had it. Recently I was shooting a moose out in the water. I had the 70-300 on my D7200, and the 300 with teleconverter (420mm equivalent) on the D500. I was close enough that I needed to use the shorter lens. And, not knowing how long Bullwinkle would stick around, I wasn't about to take the time to change lenses. You might think that there is no reason for fast frame rate or a large buffer for a moose in the water. The fact is, though, when trying to get just the right pose and take advantage of the limited possibilities due to the lighting, I was letting the shutter fly as the moose changed positions. I filled the buffer more than once with the D7200, and the fps slowed down as a result. I got some great shots, but certainly would have preferred the D500's buffer and more shots to pick from.
If you do decide to grab a D500, I would sell your D7200 privately, as you will likely make out much better than a trade in.
Also, rest assured, if you stick with the D7200, you've got a very capable camera.