Certainly not if the attendance at my local site is anything to go by, echoing similar comments, have seen the site go from 40-50ish to more of 60-80 people per week, the site has also introduced x3 Milsims a year & have recently started doing mid-week games, all of these have had sustainable attendance that they remain as part of the annual calendar of events
I always think it helps if the sites remain open regularly, that way they build up loyal customer base, word of mouth can then spread. Outside of where I skirmish on a regular basis, attended UCAP Sandpit on two occasions & both times there were x180+ in attendance.
Airsoft is very much alive in a big way in Kent!