There's been a lot of people alluding to state pensions being done away with or means tested for many years across most countries that provide it.
The question posed by Cervelo above is an interesting one: "Will "Auto Enrollment" have any future negative effects on the value of the state pension or who will be eligible to claim it??"
When changes are made to pension entitlements, there are obvious reasons why they are made in a slow and controlled manner. Take, for example the 10-year phased removal of the Yearly Average Method. This is done because, with less than 10 years to retirement, one has insufficient time to plan if they had assumed their pension was going to be calculated on the yearly average method.
I'm not sure that the state pension will ever be completely removed or made entirely means-tested as that'd be political suicide. I wouldn't be surprised, however, to see the government make a move along the lines of the UK's "stealth tax" on income in recent years where they froze income tax bands from 2023 to 2026.
Basically, the UK income tax approach was a tax by inflation. Over the years, it pulls more lower income people, including pensioners, into the tax net and has higher income earners pay a larger percentage of tax at the 40% band. There wasn't as much uproar about this as there would have been about a 1% increase in income tax rates as people don't tend to see it immediately.
As of 2020, 64.7% of Irish people had private pension coverage, an increase of almost five percentage points on the same period in 2019. If people in 2019 had under 60% private pension coverage, it's very difficult for the government to make moves on the state pension. If auto enrollment were as successful as one might expect, private pension coverage would be significantly higher and such moves would be less impacting on the general population.
I guess what I'm saying is that I don't expect state pensions to be removed or means tested. However, I do expect the pressure on government to deliver the inflation-busting rises in state pension rates experienced in the past to be lessened. Instead, I would expect sub-inflation rises going forward and an emphasis that if one were to opt out of auto enrollment, especially at an early age, they do so at their own peril.