Sadly Bitcoin won't be a world currency. That was the original intension and dream but the technology hasn't enabled that so it's pivoted into becoming a digital store of value, digital gold rather than a currency for buying stuff.

I've been disillusioned by the industry, but not by Bitcoin. Bitcoin was born of a vision to decentralise and break centralised control and too big to fail mentalities. A lot of Bitcoins value has been captured by a wealthy elite which is unfortunate, but there are still people in the Bitcoin community who believe in the mission. The same can't be said I don't think for many other digital currencies that have just jumped into bed with banks and regulators in a hope to become as relevant as Bitcoin.

For me the landscape is this.

Bitcoin - Decentralised digital golds, store of value. A lot of value captured by the old money world that could afford to buy up Bitcoin and by a some new money. Still mission led at its heart and is battling the corrupting influences that are plaguing the industry.

Ethereum - Decentralised money, and finance. Some good mission led projects but network is elitist and jumping into bed with regulators and the old money world to get the boost it feels it needs to be bigger than Bitcoin. Even the stake for validators cynically is priced to keep the poor riff raff out.

Solana - Better version of Ethereum, better technology, less confusing, more mission med. Starved of capital still and will either remain Ethereum's smarter little brother or will become the over-achiever in the DeFi family.

If looking for digital money I'd look more towards Solana or Ethereum layer two's but when it comes to mission and long term savings, I don't see anything toppling Bitcoin short of some truly catastrophic effect hitting Bitcoin such as quantum.