Self check in and automated baggage drop are fine in principle.... BUT
What happens to your passenger throughput in your terminal devoid of personnel when the darkness hoover (*) goes U/S? and probably ever so slightly more importantly, who does the initial passenger profiling for potential hijackers [I so miss the '70's] or worse' body language?
(*) - other manufacturers of dust removing apparatti exist and are available for your purchase at a retail establishment of your choice.