I'm going to tell you a harsh truth. Unhealthy relationships, and bad writing, exist in all timelines. Someone else will write a different bad book that will be unsettlingly popular.
I've come to see it as a matter of self insert fantasy, rather like how Batman can appeal to people as being a badass. Bella Swan and the "Fifty Shades" lit is a self insert fantasy for sexuality. Pointing out his unhealthy it is is like pointing out how Batman would actually be a terrible way to address the root cause of crime. The audience for it just wants a nice break from their shitty and/or mundane lives.
So there will almost certainly be a Twilight analog ITTL. It needn't have fantasy or horror trappings, but it'll be the same sort of self insert romance fantasy.
Plus, it's not like there's a shortage of unhealthy relationships depicted as otherwise in modern pop culture. "Passengers" and "Beauty and the Beast" might've attracted some negative comments, but they made major bank at the box office; you could even make an agreement that they're worse than Fifty Shades of Grey despite all the bile it gets. At least the heroine leaves at the end of the first book/movie, and the love interest lets her go. Jennifer Lawrence and Belle just get to enjoy Stockholm Syndrome.