Yes. It has been discussed here with citations of similar overload cases and was my first guess based on overhead video footage not showing some gaping sinkhole. However, based on the preliminary security video footage, it sure does look like the action started at the bottom-so thinking shifted to sinkhole, water table, or some other kind of subsidence. It will be interesting to see what the engineering investigation finds and what kind of issues,if any, were noted prior.
We see spans, bridges, walkways, tunnels and buildings under heavy repair or construction have catastrophic failures pretty regularly around the world. I don't recall anything like this that came on without warning and was so sudden and almost precise in its failure. I mean there are plenty of buildings that fall down but most of the time some flaw is noted, evacuations occur, the situation is monitored and it either collapses on its own or is demolished.