Well, time will tell, but judging by the outcry after the removal of the WFA I don't think the mood of the country would take kindly to a contributory benefit being stripped from those who have paid NI for decades, at whatever level.
It's not (and shouldn't be, IMO) the amount of ££ that someone has paid in that counts, but the number of years they have contributed to the economy and the welfare of the country, whether that is by caring for those who need it or by producing goods for others to buy and use, or any of countless other ways. It is a strange mindset that sees all contributions to society as financial.
Those who earn more get tax relief, so pensions are cheaper for them, and yes, there is a taper, but that is to prevent them from sheltering money from tax in a pension scheme. It is not a 'trope' to say that high earners can support themselves in older age - it is a reality. Anyone paying higher or additional rate tax is likely to be paying into an occupational pension, or into a private one, both with the incentives that entails. The vast majority of higher earners will not be surviving on SP alone, but many lower earners do just that.
When people who have worked for low pay (often as one half of a working couple, paying childcare and both juggling jobs and other responsibilities to make ends meet) see others opt out of working and ending up better off because of gateway benefits, then of course they resent it. You'd have to be a saint not to, really. When they then see others getting free social care in older age that has to be paid for by those who have saved or bought a house the knife twists more. Accusing them of 'unpleasantness' for feeling it is unfair is breathtakingly insensitive.