What games do you know that use this type of changing number pieces?
The first game I saw with a rotating number dial on the base was Adeptus Titanicus, followed by Space Marine, both of which used it to track shields on titans. I expect there were dozens of games prior to those two which used a similar mechanism for single-number tracking.
The thing Wizkids did with their click bases that I'd not seen before was tie more than one stat line into the same rotating disc, meaning that as a unit got more damaged its combat capabilities changed... which is quite a significant difference from previous rotating-disc-tracking-stats games I'd seen. My gut feeling is that if you're just tracking a single stat it's probably fine, but if you try and do the changing-combat-capabilities thing, that's probably where you come into conflict with Wizkids' patent.
But I'm not a patent lawyer and I've not even read the patent, so take that with a pinch or two of salt!