Sure, you can convert anything to anything if you can find someone else that wants to complete the trade at a suitable rate.
Taxes provide [part of] the reason to believe a market to exchange Aussie dollars will exist in two years time: tax and Aussie-dollar denominated debt mean a lot of people need Aussie dollars. That's the only reason the Aussie dollar is worth more than the plastic its printed on. BTC doesn't have that reason [to any meaningful extent; credit is a tiny part of the economy and nobody needs BTC to pay taxes] and unlike the fruits of your labour [which I'd hope are more useful or entertaining than an alphanumeric string even if they can't be exchanged in future], it doesn't have any non-exchange-related reason to be worth anything either. The some-people-need-it-to-pay taxes argument is why Aussie or US dollars aren't bad despite being as intrinsically useless as BTC.
So the argument is that BTC is bad because both intrinsically useless and almost entirely lacking a mechanism [similar to taxes] to create a stable flow of future demand to acquire it
Taxes provide [part of] the reason to believe a market to exchange Aussie dollars will exist in two years time: tax and Aussie-dollar denominated debt mean a lot of people need Aussie dollars. That's the only reason the Aussie dollar is worth more than the plastic its printed on. BTC doesn't have that reason [to any meaningful extent; credit is a tiny part of the economy and nobody needs BTC to pay taxes] and unlike the fruits of your labour [which I'd hope are more useful or entertaining than an alphanumeric string even if they can't be exchanged in future], it doesn't have any non-exchange-related reason to be worth anything either. The some-people-need-it-to-pay taxes argument is why Aussie or US dollars aren't bad despite being as intrinsically useless as BTC.
So the argument is that BTC is bad because both intrinsically useless and almost entirely lacking a mechanism [similar to taxes] to create a stable flow of future demand to acquire it