Can you elaborate on the endemic corruption in the zoning and planning process (current examples please)?
How/why should speculators be cracked down on, do you mean recent entrants into the speculating game or the old hands who've been at it for years? Is there not already government regulation, taxes etc, both income and cgt?
As for cracking down on lending and marketing practices, firstly, surely it's up to a lender to adequately vet their own loans, they can assess the likelihood of default better than any civil servant, after all, they're hit in the event of default too. Secondly, as I stated before, lenders don't force anyone to take out a loan, are you suggesting that borrowers are incapable of making the decision for themselves, and that some government agency should make that decision for them?
As for your assumption of 5 times average wage, where does that come from? Do you mean average household wages (given two parties working), in which case it's pretty close to what we currently have.
I do agree that houses are overpriced in this country btw, but I will not accept that speculators bear the responsibility for that, investors take advantage of prevailing conditions, many recent investors probably shouldn't have got involved, they'll learn the hard way (possibly), in fact, will recent investors (many of them are of the traders up who retain property no.1) not be the hardest hit of any sector? Double mortgage, probably well over-extended with little or no rental income from property no.1.....