Future generations (children and grandchildren) will face increasingly large mortgages (e.g., £1 million, £2 million) that they will be unable to repay.
"your kids will have larger and larger and larger mortgages they will have larger and larger amounts of debt you know it's already normal for an ordinary person to have half a million pound of debt in a mortgage that will become one million that will become 2 million and that means that your kids and your grandkids will end up with mortgages that they can never ever ever repay"