Google tells me that In the UK, the average income for a single pensioner is £282 per week (£14,664 per year). For retired couples, the average combined income is £595 per week (£30,940 per year). This total includes income from the State Pension, workplace or private pensions, and other investments.
The source for that is The Private Office, and I don't know what, or how reliable it is, and it's not clear what sort of average is being used, but it's a start.
As those figures include SP, it's very clear that cutting SP for people with above average earnings would make life impossible for average citizens. The figures take no account of property or other assets, but cutting pensions on the assumption that older people could sell up and release equity (so move away from the friends and family and other support networks) would be cruel, and wouldn't help much anyway. Also, it would mean that those in subsidised housing with nothing to sell would end up better off than those who had bought a house over many years.
Add to that the fact that people with houses are expected to sell them if they need care, that those with even small occupational pensions don't qualify for things that go to those on PC, and so on, there would be no point in saving anything at all for those who can't afford to save enough to lift them right out of that situation. People pay into pensions and savings so that they will be better off in older age than if they hadn't. If that's not going to happen, then why bother doing without when you're young enough to enjoy your money?
If large numbers of people don't see the point in paying into pensions, or saving for older age, as it will be taxed away or taken from them in care fees or whatever, the welfare bill will rise exponentially. More and more people will realise that they'd be better off on PC and spend their spare money on cars, holidays etc.
As usual, those with significant pensions and/or savings often can't imagine what that dilemma might be like, and nor can those who have always lived on benefits or minimum wage with no choices about how much to put aside for older age to be made.
It's the same people who are affected - the 'just above poor' and the 'not quite comfortable'. They are the ones who pay tax via PAYE (so no allowances for this and that), work long hours, pay rent to the better off or mortgages to the bank, and so on. Average people, basically. And they are the ones who are sick to the back teeth of finding that it was all for nothing, as they'd be just as well off if they hadn't bothered.
I really think that it is this group who need to be considered, as they are numerous, and getting more and more disenfranchised. They are, therefore, more likely to turn to Reform and so on than those who are comfortable (or wealthy). I don't know the answers, but we need to stop making tax on 'working people' the default way to raise money, and look at other ways of doing it.