At some point they'll figure out that "one day to God is like 1000 years to man" is simply an easy way to explain an infinite time span.
Consider to whom it was being said. People back then could reference Methusalah's lifespan being nothing when it comes to God time.
It isn't a literal fixed time frame. It's an analogy.
So called Christian "leadership" get on my nerves with dumb reasoning when they could simply ask Jews what THEIR early writings mean.
Also, it isn't a JW thing, it's a fundamentalist Christian belief; JWS are like the fundies from wence they came. Adventist groups are crazy like that.