I'm pretty certain we are seeing a paradigm shift in UK politics. Tory and Labour aren't because ... well because they are Tory and Labour and their jobs depend on them not seeing it. A little like your boss who insists now is a great time to increase your high street presence because the internet is "a fad".
In the case of politics, the internet - social media particularly - have created an environment where people of one view can suddenly connect with like-minded people in an instant and for free. Something that simply was not possible before. That's how we can see a new political party emerge in less time than it takes to make a TV series.
Of course more political parties lowers and raises the bar for the existing ones. Tory/Labour may have breezed into poll position in a seat when there were 3 main parties plus a scattering of localised candidates. But how will they fare when you have 4,5,6 "main" parties, each capable of taking 10% of the vote ? And then aggregate that up across the country to try and form a "simple" majority of 326 seats ? Good luck with that, my friend.
PR isn't really an answer to that - it would simply even out the lumps a bit. But if you have 5, 6 parties each capable of pulling in 20% of the electorate ...
That isn't going away anytime soon.
Ironically, for a system that can't move for marketing-types obsessed with themselves brands, the Tories and Labour have managed to do a spectacularly bad job of explaining to the public what they actually stand for. I've been following politics since "Thatcher, Thatcher, Milk Snatcher !!!!" (as my DM chanted outside the school), and I don't think I am alone in admitted I really haven't a clue what Conservatives or Labour actually mean. And being honest, I would be sceptical if anyone on this thread - possibly one of the most well informed general discussions in the UK on Brexit - knew either.
The (relatively) sudden introduction of printing to Europe - and the exchange of opinions, ideas and knowledge that it engendered triggered a process of change that saw the previous World Order (as it was seen) to undergo centuries of violent change. With "fake news" being as much an accusation used against Luther, as Trump et al use it today.
Fans of such things may recall James Burkes "The Day The Universe Changed" where he holds up a pamphlet (16th century version of a tweet) and noted it was written in Latin for the cognoscenti, German, for the local middle class, and a picture for the peasants. (... and in either form, the message was clear... (raspberry noise)
). Looks like we are retreading that time in history. Let's hope the clothes are better, and burning at the stake is deemed too unGreen.