FWIW I owned the 200-500, and currently own the 500 PF and have never felt any need to replace the foot on either. 
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Yeah, the 500 PF is a great lens, and a significant step up from the 200-500. Congrats and enjoy.OK, Just received my new 500 PF 5.6 lens today and immediately went out for a trial. WOW, so nice and light and compact compared to my 200 - 500 f 5.6 Nikon lens. I did also order the replacement foot plate (Nikon AF-S NIKKOR 500mm f/5.6E PF ED VR lens arca type foot replacement with QD ( Quick Detach ) socket. By Hejnar Photo. Should be here on Monday.
Here is one of my first shots and a local pond that was covered with algae (accounts for the green legs of the Green Heron) and a Green Heron that was nice enough to pose for me! I am excited.View attachment 69229