If there is a market for short-term to medium-term social tenancies then why not create one - just do not make it compulsory, and ensure that their is equitable alternatives in the shape of long-term social tenancies.
There are a number of issues with the latest (it's been a week so time to have another) proposal from this new government:
Removing the right to start a new long-term tenancy at the same time as introducing greater mobility (i.e. people having to leave their current tenancy) will by stealth end current tenancy agreements. In certain LSVTs where transfer with rights has occured those rights have not survived the decant. This will work in the same way.
Removing the right to a long-term tenancy and insisting on removal if you pass a certain income limit effectively ends the right to buy. Now I'll be glad to see RTB go, but not at the expense of the loss of housing rights and social choice.
Ghetto creation was an on the shelf policy in 1991, but this would bring it into practice, with all of the associated social and welfare costs, potentially blighting generations of disadvantaged and socially excluded.
This is an example of government by an elite who have no connection nor understanding of every day life and living. Like the little thought out proclaimataion against the State of Pakistan this Prime Minister needs to learn when the unthinkable should be unspoken too.