If they never get on the property ladder, what kind of 'retirement' and where do they face? With house prices outstripping wages by a huge margin and 'bank of Mum & Dad' not available to many to help with a deposit, I foresee vast numbers of ageing people living their whole lives in privately rented accommodation. Unless regulations change, they could be given 2 months notice to leave whenever the landlord wishes. At eg age 70 that really is a grim thought. 
My dc's are 13 and 11, so considerably younger than Generation Rent, but I cant see how much the situation will have changed by the time they hit their mid-twenties.
I feel a right doom & gloom merchant but I don't think I'm wrong and have seen no evidence of the government or opposition parties trying to understand and/or tackle this issue.