Things go in cycles. In 10, 20 years time the pendulum will start swinging back left again. It never moves that far from the centre in the UK. It's not even moving that far right, it just moved so much to the left in the Labour area that many left wing supporters just see the left as the centre when a majority of the general populace don't.
I have always assumed it would swing back eventually. As I said earlier though, it's been swinging more right than left for the last 37 years and it's gone further than it's been in my lifetime. There's a sense that greed is good, which wasn't there before The Thatcher/Reagan period. There was some swing back under Labour, but the neoliberal 'dream' prevailed, and with it, the increasing inequality that is a the root of much anger and unhappiness.
I also feel democracy is being lost to a right wing media and a poor electoral system that is not really representative, if that answers your comment about why people living in a democracy might not be content.
I also wonder whether actually, in itself the swing politics is a problem. Scandinavian countries often have coalition governments. It's harder for one side or the other to move things too far. The Tories spend loads of money moving everything right, then Labour spends more moving it all back again. Nothing really improves because there is no long-term strategy, other than 'we have to reverse everything'.