Many agree the state pension as it currently works is not sustainable. When it was set up it was linked to life expectancy and there were many workers for every pensioner, but these days it's the biggest cost from the welfare budget and there aren't enough workers for every SP recipient.
The age is going up to 67 soon, and will be 68 for anyone born after 1978. I'm in my 30s and expect the age to be into the 70s for my generation.
But while people are living longer, that doesn't mean people are going to necessarily be healthier and able to work into their 70s. I believe that for many, they will have to use their private pension to 'bridge the gap' from the time they can no longer work until they get the state pension (whatever age that will be). So private pensions will need to be used 'before' rather than 'alongside' the state pension. And that's I think that's why there's such an emphasis on them these days, so people in their 60s will have something to fall back on.