Be seething all you like, that's the reality. Clubs like Thurrock are watched by 100-120 most weeks and only a core of around 50 or so are diehard fans (even of those, many have affiliations to "bigger" teams in Greater London, such as the Hammers).
The support reminded me of a Scottish junior following- many of whom aren't wholly affiliated with the club as such but just enjoy a decent game at a reasonable price and will go wherever locally can provide that on a Saturday. It's the last whisper of the old fashioned "neutral" who used to be a much more common type of football supporter back in the 1950s/60s; someone not affiliated to a club as such but to the game itself. The die-hard one club ultra style fan doesn't work at every club at non league level.
Apparently many Thurrock fans are already planning to follow "Stimmo", and no doubt half the current squad, to wherever the alopecian gaffer next lands a gig. Thurrock's very successful junior set up is apparently in talks with Grays Athletic about moving lock stock and barrel to there.
It is sad and I am sure someone with money could re-boot the club in the Essex seniors if there was a will, but there is no sign of such a person emerging. I'm not going to criticise the outgoing owner who created the club from scratch, who has been ill, and wants to spend what time he has left with his family. It's a very rare case, a football club going down the tubes without one bad man to point the finger at, but this would appear to be an example. I am sure if there was a viable future ownership for the club in the Isthmian Premier he'd have been only too delighted to do a deal.
This rather good article a few years ago puts the area and its small football clubs into some kind of perspective.