LMS makes the argument that Wikipedia right now is much worse than it has been in the past.
He asserts that there is an ever-growing group of destructive members.
I don't see that. There seems to be a pretty fixed number of Wikipedians who write "write nonsense, brazen political propoganda, crankish unsupported stuff" on a consistent basis.
And that fixed number can be counted on one hand.
It is a problem that people stop editing out of frustration, but the evidence just isn't there that this is a ballooning problem.