Then Turner bought them I think, then WB bought Turner, and IIRC just kinda merged them into Cartoon Network because having two studios in the same city is kind of a waste or resources. Also the whole rise of sending work overseas to Asia where your dollar buys an order of more magnitude more pencil mileage; animation was at the forefront of hollowing out the American industry by substituting cheaper labor across the globe.
Or at least that's what I recall from growing up in the seventies and being in the animation industry in the nineties/00s.
People who were kids with no taste and a lot of time to fill during the time they dominated Saturday Morning have fond memories of their characters but that stuff really does not age well. It maybe ages slightly better than most Filmation work. Slightly.