I also have seen a dramatic drop in traffic numbers. I don't have much traffic myself yet but my numbers were typically in the 400-1200 range. Two days ago I and 93, yesterday 383 and today it is 83.
My traffic monitor shows decent attendance. below is my hourly summary taken at 01:19 SL time this morning.
SecurityCentral: 00:-- 01:51:50 01:-- 00:31:20 02:-- 00:02:30 03:-- 00:29:40 04:-- 01:31:00 05:-- 02:40:10
SecurityCentral: 06:-- 01:33:40 07:-- 01:02:10 08:-- 00:48:50 09:-- 02:30:30 10:-- 00:07:10 11:-- 00:00:50
SecurityCentral: 12:-- 04:02:10 13:-- 00:51:10 14:-- 00:03:40 15:-- 02:42:40 16:-- 04:58:10 17:-- 01:03:00
SecurityCentral: 18:-- 01:32:50 19:-- 01:54:10 20:-- 00:58:20 21:-- 00:36:10 22:-- 01:30:00 23:-- 00:10:30
36 distinct avatars were reported.
I don't understand how the number could possibly be that low.