Thanks! Yeah, for analog the case is obvious, both because there's no such thing as an analog FPGA and because smaller feature size comes with big drawbacks for analog; that's why I said, "why would you fab a digital design in 130nm". The others I'm less sure about, but they do sound plausible.
Yeah, there have been a dozen different attempts to make "an FPGA, but analog". This is one of them. They all failed. You'll note the page hasn't been updated since 02006: https://web.archive.org/web/20060715013941/http://www.anadig.... Analog circuits aren't fungible the way digital circuits are.
I'm not saying it's not a worthwhile research direction, just that it hasn't borne commercially viable fruit so far, despite decades of attempts.
