1) Hard Times require Hard Decisions.(A) will not happen. This is one AAM myth that refuses to die. There will always be a contributory state pension which is more than the means-tested one.
(B) is likely - it wouldn't surprise me if in my own retirement the SPC is lower in real terms than it is today. Indeed it is lower than it was a year ago and there is barely any notice of it!
2) The government in the past has 'Raided and Robbed' our pensions, as ranted about by Joe Duffy on the RTE only yesterday.
3) Other countries have interduced a means test for state pensions. Eg Australia: https://www.servicesaustralia.gov.au/assets-test-for-pensions?context=22526