House prices depend on the avaibility of credit and the growth of credit.
Rents will only go up until the average person can't afford it no more. At least 30% of houses around where I live are under occupied in my opinion. I start by myself, do I need a 5/2 with pool as a single adult with two kids ( staying atm 60% with me ), NO. Every third house I know could share or rent a room. Another 10-15 rent increase in perth and we are there.People will start sharing, if they like it or not.
I do give you, we have a rental shortage and rents are going up atm.