A couple of points about this:
For a start, the increase in house prices doesn't bring a corresponding increase in wealth to those living in the houses. If a couple bought their house in 1970 for £5000, and it's now worth £355,000, this extra 300K is not accessible wealth. They bought a house, and they still own the same asset - a house. The only way they can realise the asset and benefit from the increase in property values would be by selling up and making themselves homeless.
The other thing is that these much-envied houses that many of us have bought and worked for over a lifetime will not vanish into thin air when we die. In a few cases, they will have to be sold to pay for care, but in most families, the house will be passed on to the next generation, so they'll inherit this as an unearned asset.
In many families, this process is already under way. The boom in home ownership in the middle of the last century means that houses are already being passed down as inheritance, as the generation born earlier in the century die off. The beneficiaries may well be people of the Gransnet/baby-boomer generation, but again, this wealth isn't lost, much of it will filter down to our children and grandchildren both during our lifetimes and after we die.
So the younger generations should be grateful, rather than envious, if they have richer parents and grandparents than we did, as they will get a share of this wealth.
Of course, all the above applies only to those who own property. Families who have only ever rented their homes are further than ever from being able to buy a house. The big gap is not between the generations, but between the socio-economic groups who own property and those who do not.