pessimistic doom-mongers are right
Many of the effects are already in evidence:
A PM who's whole career was built on lying.
A government unaccountable to parliament.
A legal system under attack with underfunding, and moves to make executive action above the law are in progress. (that is the the government manifesto).
There is already much more increased explicit racism and xenophobia.
Dishonesty and corruption at the highest level now goes unchallenged.
For example, contracts to supply PPE were given preferentially to companies with close personal relationships to MPs or were party donors. Many of such companies had no experience in PPE supply of even international trading, given most were obtaining supplies from China. Indeed a fast track channel was setup for such companies.
We have a record number of food banks (true before covid struck). The existence of which one government member found 'uplifting'.
The social support infrastructure in this country is under resourced and failing.
The country is more divided than ever.
The UK's global and regional influence is badly damaged.
The people of NI now have more rights than the residents of Great Britain.
The UK itself is highly fractured and likely to break up.
Our finance industry is now exposed to steady attrition.
This is already happening. It isn't pessimism. Its observable fact. Calling this 'doom mongering' is insulting.
I can only assume that you are in favour of all of the above. If that is the society you want, and again I can only assume it is, it isn't one I wish to share with you.
In 10 years, if this is reversed I will be relieved (or dead). But any reversal will be in direct opposition to the current direction of the country, a direction you have backed.