They will regenerate into something more acceptable to the electorate they serve. This latest iteration will be seen as a low water mark and derided by historians...
The evidence would suggest the opposite if the current political and electoral systems are maintained. Minority and extreme voters already have the edge, particularly on the right, as centrist right leaning voters don't seem to have a problem defending and voting for extreme Tories and extreme and often quite stupid Tory policies, Brexit, silly immigration tropes, trickle down economic policies, slashing public services, privatisation, tax cuts for the very rich, etc etc etc. Keeping labour out is a key consideration.
Very left leaning voters do seemingly have an issue with centrist and right leaning Labour candidates and policies, so alternatives to labour will be sought, often splitting the leftist / social / progressive / liberal vote, and with first past the post and a typical 65 to 70% turnout, many MPs are polling at little more than 30% of the electorate.
Rishi Sunak spends more time appealing to the tiny minority of Farage supporters than actually fixing or even considering fixing deep seated problems in the UK. Additionally, the selection process for Tory candidates is often driven by acceptance from the right wing popular press, which in turn are being influenced by the various libertarian, corporatist, ultra privatisation, and other right wing lobby and pressure groups, who are funding campaigns for their favoured candidates and at the same time undermining anything that goes against what they want.
I can only see the Tories lurching further rightwards, fixing 50 plus years of supply side economics policies, privatisation (profitisation) of essential services, declining standards of living for the vast majority, the oncoming social and economic climate driven crisis, means coming up with policies that are fundamentally outside of current political thinking, taxing major corporations and the very wealthy for example, proper policies to solve the problems associated with Brexit, the problems associated with the hyper risks in the financial sector and the markets in general, trying to fix an economy that is majority rentier, when the people the Tories really represent are the big capital owners, the big banks and the big corporations. if you cant fix the actual problems the easiest thing is to turn the conversation / debate / opinion articles in the press (including the BBC) to soundbites about, boats, or blaming europe, or worker lazyness (efficiency), or crime and policing powers, and that specifically requires candidates and a party that is prepared to tow the line that the funding bodies and the press want out there.
In order for Labour to get elected they will have to move rightwards, they will have to embrace more privatisation, increased police powers, take a conservative illiberal stand on "the boats". Its what Blair did, and its what Starmer is doing.
this Tory party is some way distant from hitting rock bottom as the overton window for acceptable levels of bigotry, hypocrisy, incompetence , corruption, self serving-ness just keeps falling year on year, and there is no sign of the stopping.
Its a depressing view i know.