im looking at possibly buying this one when markets crash soon,...

im looking at possibly buying this one when markets crash soon, as its in US$, I think this should be a good bet, if markets crash, sure healthcare stocks in the US will fall, but healthcare is a good defensive buy, like GOLD stocks or DEFENCE stocks, and if markets crash, the US$ should for god knows what reason go up, as people flock to the perceived safety of the US$, which means the AUS$ might fall to 60cUS or even 55cUS, which in turn means IXJ might even go up in a US market crash or at least be steady, as the AUD$ dropping will help the stock. anyone got any thoughts on this one for the long term?