Bitcoin's literature has grown apace with its price. There is no end to how much you can read on the subject. I will not be devoting my life to reading the Bitcoin oeuvre. But I've read enough to have an opinion, which hasn't changed since I first heard of the phenomenon.
The theory behind Bitcoin is that the ultimate supply is finite, at 21 million. As it grows in acceptance as a medium of exchange, it will rise in dollar value, much as gold has in the last 80 years. As one believer says:
Permit me to list some of the rather useful attributes of the dollar, and the less useful attributes of the Bitcoin:
>If a malicious actor or botnet obtains control in excess of 50% of the processing power active on the Bitcoin network, such actor or botnet could manipulate the source code of the Bitcoin network or the blockchain in a manner that adversely affects an investment in the shares or the ability of the trust to operate.