Except that Sig is actually cranking out new models at an impressive rate. One can debate whether every new Sig variation actually constitues a "new model" or not, but the fact is, Sig is selling the crap out of pistols these days. CZ is not doing that.
Sig may be continuously cranking out new models, but they have a nasty reputation for suddenly dropping parts and customer support on the previous models, leaving their customers in a lurch. For that reason alone, I would never buy another Sig product under the current management.
In my experience, sure, that has happened with some models that have been discontinued. But I've owned numerous Sigs for years, and have not experienced that with any of the Sigs I own - P229, P226, P220. I'm not sure how long one should reasonably expect a company to continue to support something they don't make any more - a few years?
Regardless, I'm not trying to make this about Sig, or about a comparison between the two brands. I was only pointing out that we really haven't seen much new from CZ (or Colt or DW) in quite a while. And while I'm sure there will be people who arew perfectly happy with what these brands already offer, and don't personally care if they release anything new, I don't think it's a realistic, sustainable business model to just keep churning out the same stuff year after year.