Bitcoin's entire value, literally all of it, is just an index for how widely and strongly felt HODLology is across the globe. The sale of a bitcoin is a cult member leaving, the purchase is a baptism, however transiently intended the purchase is, because the purchase represents the new recruits own belief in HODLology.
I don't expect it to go anywhere. It seems to have a niche purpose, but will never gain mass adoption.
I make another prediction: By 2030 not a single cryptocurrency will be used mainstream / have replaced fiat currency. The strongest will still be Bitcoin, but it'll be as weak or non-existent for normal people like it is now.
I predict that gaming could see a huge uptick in crypto-currency usage. Could you imagine a game like Grand Theft Auto or World of Warcraft utilizing a crypto-currency rather than an in-game artificial currency? You could create entire in-game economies with real life value. People could actually make a living by playing games full time as scary as that sounds.
Could you imagine the moral implications of someone robbing you of crypto-currency in a game like GTA or some survival game?
I just think there's some very creative use-cases for crypto-currency that will pop up over the next decade.
BTW, people already do make real-world money grinding for WoW gold.