Let's say you live in Perth and bought a home 10 years ago for $500,000 and paid it off but it's now worth 20% less at $400,000. Your intention, as is often the case, was to sell it and step up to a better home in a better area. Say the intention was to buy a $1,000,000 home which would have been another $500,000. This time that same home will be $800,000 so only $400,000 to borrow and the interest rates are so low it's only $250 a week for the interest so it can be paid off much quicker than before. Same dream house for much less and in a good location it will be a solid investment.
