True, but what I find strange is that everyone seems to think that it marks the end of the far left in the party. I suspect it's just the first shot of a long and bitter struggle to come. A necessary battle, but it won't be a quick one I'm afraid.
The party will always have a spread of factions from center left to far left. And the balance of power will be cyclic.
But none of that matters while they are in opposition. And they have been out of government for far too long. Much of that time self inflicted.