There may well be a glut of properties that have been ditched by landlords who don't have the commitment to make the houses meet the standards of the day, but if so many buyers want three bedroom dwellings, why are developers still building them? Eventually, local authorities wthat have a real problem providing enough homes will either redevelop the streets where they are, or take them over and insulate them to a respectable standard. There is no other option with houses that have no special features that would permit them the remain as examples of a particular decade's residential buildings. Most of them are in towns/cities so land is too precious to just leave them effectively wasting the space in thich they stand.In an ideal world yes it would be wonderful for all the BTL properties to be bought up by homeowners getting a foot on the ladder.
However, this isn’t always the case. There are always those who are not in a position to buy or want to rent due to the flexibility. No matter how much BTL is maligned, there is always going to be a need for privately rented housing. Where I live in the North West, there is already a glut of ‘2 up 2 down’ terraced housed on the market, for very reasonable prices, as more and more landlords have tried to sell over the past few years. Nobody wants them. First time buyers want 3 bed new builds with a drive and garden. So they sit on the market empty, gradually deteriorating and often end up in the auction.
Meanwhile here at least, there is a ridiculously long waiting list of prospective tenants looking for rentals with not enough housing supply to meet this. Rents are increasing due to demand, with multiple people bidding on the few properties that become available. This is a situation which is going to become much worse.
Indeed there are some terrible landlords (as there are tenants) but the majority are trying to do the best for their tenants but are genuinely worried about how they are going to meet the cost of these changes.
Anyone 'investing' in BTL property has to understand that however attractive the deal was, things have changed and will change even more in the near future, so if their assets lose value, that's the payback for the gravy train years that came about through the housing ladder addiction.