They kind of got replaced by "table oriented" query languages, like SQL. Arrays can get very unruly to coordinate, manage, and/or comprehend. Tables tend to ensure a bit more structure and can "do" most of the same things as arrays if you normalize properly.

SQL is probably not the ideal "table processing" language, but it's good enough and a strong enough standard such that competitors have yet to unseat it (although I'd like to see more competition, such as Tutorial-D/Rel, SMEQL, etc. fight it out in the market-place.)