(Part of the answer to why Labour has been out of power for 13 years is the Corbyn disaster, it explains half of that time span).
[0]: https://commonslibrary.parliament.uk/research-briefings/cbp-...
That's why you got stuff like his face getting greenscreened onto a clip of voldemort on the BBC.
One thing that people underestimate is just how far to the right of the general population the media and political class is. They tend to be private school dominated, overwhelmingly drawn from southern england, and personally wealthy.
The situation is not irretrievable in theory, at this point.
The problem is that in practice a solution requires the political elite to collectively admit the falsehood of the axioms they built their entire careers on.
If an individual political leader defects from the nationalist-neoliberal consensus, then they get treated exactly the way Jeremy Corbyn was. Corbyn was a soft-brexiter -- his distrust of the EU was based on it having emerged from the EEC, as a capitalist institution: what they hated him for was for being an unreconstructed hang-over from the 1970s when Labour was actually a left-wing party.
Neoliberal politicians can't admit that the crisis is rooted in neoliberal policies.