Wouldn't it be logical to consider that the boom in itself constitute a signal that a burst will occur in the near future?
I personally have a non-conventional opinion on boom and burst. I don't think that it's a clever idea to keep the boom going by artificial means. I would rather promote a strategy where the price depreciation is seen as a natural consequence of the boom itself. Impeding the market to react in a natural way and regain the balance, it might look like as a good idea at the first sight but in the long run it has been shown that this strategy has bad consequences for the poor. The statistics show that during the previous financial crises the gap between the rich and the poor widened and the current crisis has obviously the same type of effects. Easy access to easy money makes one rich(er), while the poor and unemployed will have to experience the reversed social trip (apropos of social mobility).