I was pretty critical when the Intergenerational Foundation called for the government to adopt measures to stop the 'hoarding' of housing by older people. More recent efforts by Grant Shapps to get councils to help the elderly move if they want to have a better feel to them.
The BBC describes the new voluntary scheme as working as follows:"Under the scheme, the council will arrange for elderly people to move into rented accommodation, and then take responsibility for maintaining and letting their property at an affordable rate. The rental income is then passed back to them [...]" Providing the scheme is truly voluntary, then lowering transaction costs in this way may be a relatively cheap way to increase the supply of space (a pilot in Redbridge suggests that this is indeed the case).
But, and it's a big but, this is likely only to lead to a small increase in effective supply. Why? Because it turns out that not that many people appear to be 'trapped' by moving costs - according to the Telegraph "Government analysis of the Redbridge project suggested that 200 people in the borough were considering moving, but felt that they could not afford to." And this presumably represents the 'stock' of people who feel trapped rather than the annual flow. If so, the scheme may be helpful, but doesn't offer a radical solution to the housing crisis. My preferred radical solution remains to build more housing.