all jokes aside but we can hardly aspire to a level of pricing that makes it uneconomic to build (i.e. the price of the material and a normal builders profit being less that the ultimate sales price).
How we stop it going OTT is the tricky bit, the 2 main variables being land prices and builders greed. Either we regulate the hell out of it or we let the market have at it - this being Ireland we tip around the edges of both. The banks being in their sorry state will, to my mind, stop if going wild (if you cant get the crazy mortgage you cant buy the crazy priced house and the cash buyers will eventually get used up & the market returns to normal).
Often thought limited recourse mortgages would keep manners on the bank - i.e. jingle mail scenario. OK harder to get going, lower LTV, higher deposit, but significantly less chance of negative equity arising in the first place and less of an issue if it did (jingle mail).