Oh dear the Labour party are at one another's throats, but isn't this business as usual?

It sure is!

No, I haven't seen anything like this since the 80s

I'm not a Labour voter, but now is a crucial time in our government with Brexit being a big game changer. The Tories are being given a free hand in deciding our future with practically no opposition, which is incredibly bad for all concerned, even if you are a Tory voter. Governments have to be held to account or we have no way of weighing the efficacy of their decisions.

Overall, yes because the Corbynistas will move heaven and earth to ensure their man is chosen and in turn that will move the Labour party further away from the centre ground of reality and that'll make them continuously unelectable.

Not like this, it isn't. It is entirely possible that Labour is finished as a party. Jeremy is the "leader" from hell.