I liked 2049, but I don't think it's going to be terribly relevant in predicting or assessing 2099, which is coming from a different group of people.
Okay, that's reassuring to know. Although Blade Runner sequels in general have been hit-or-miss. I think I only liked one of the short films they made to lead into 2049, and I found the Black Lotus animated series mediocre (with surprisingly bad CGI for something so recent) and gave up on it after the first episode.
My concern is Ridley Scott's level of involvement, given how unimpressed I was by Prometheus and Covenant.
I'm not sure he's ever really done a good film other than Alien and Blade Runner.
As for why replicant hunters are called blade runners, I always just figured it was a slang term for an assassin, someone who runs down and kills their prey. Perhaps it comes from the Japanese influence on BR culture. One of the Japanese words for "assassin," shikaku (刺客), literally means "stabbing/pricking visitor," which comes close to the sense of "blade runner." Maybe the "runner" is phonetically influenced by ronin, literally a wanderer or drifter, a masterless samurai working as a blade for hire.