I don't think the comparison between the ASX today and the DOW in 1929 is necessarily a valid one. I do, however, wonder what the impact on the ASX would be if the Dow fell to 3,000 - 3,500 or so (comparable to the drop in the DOW during the Great Depression).
How much further would we follow them down?
That's a very subjective question.
I hardly think my caution is downramping, and I also find it unlikely (but certainly possible) that the DOW could fall to levels comparable to the drop during the Great Depression.