I would be more prone to consider the growing interest into the crypto currencies of more people from all around the world as the main cause of the spike we witnessed.
I agree. But what kind of "growing interest" is there in cryptocurrencies? Real interest for utility and usage that will benefit ordinary people like us or interest in making a lot of money, doing speculation and getting rich quick?
I disagree with this because there are no solid numbers and facts to back up this claim. I believe it is all speculative interest that is driving the market right now.
I wonder what the price will do if Australia regulates Bitcoin.
Regulation is overall bad for Bitcoin. It limits its use. Just use fiat if you all want a regulated currency.