No, of course buy to let is not inherently bad and there will always be those who need to rent but in recent year the sector has boomed and in recent days the Bank of England has raised concern about the size of the sector and the house price instability it may cause if interest rates go up.
Between 1999 and 2011, the number of outstanding buy-to-let mortgages
grew from 73,200 to 1.39 million, plus of course there are the BtL houses boight outright. In 2015 1 in 5 properties is a rented property.
Now while I have no problems with buy to let per se, I was one of the fraternity myself for a few years. Initially the majority of properties bought for BtL were 1/2 bedroomed properties so potential owner occupiers were being pushed out of the market by the price rises from the competition from the, generally, better funded BtL purchasers. Now, BtL investors are buying bigger family houses. There is a development of houses nearly oppositemy home, most of the houses have 4-5 bedrooms. Some of these were advertised forrent even before the developer had finished building them. Rents were in the region of £2,000 a month.
The point I am making, in a very long-winded way is: the problem of the lack of family houses doesn't lie with the elderly. It lies more with young buyers being priced out of the started home market and now being priced out of the family home market by competition from BtL investors.