People think that PoW just solved the trust issue but it has not.
On one side Bitcoin still depends on miners and big countries like china could have a significant motivation to do a 51% attack in 20 years. People could form a secret org and take over Bitcoin. Bitcoin would require a lot more independent people to mine which people actually don't care for.
And on the other hand a Blockchain itself is only trustworthy inside it's Blockchain. It's easy to send trustworthy money around but the fraud doesn't happen when exchanging the money it happens when real life items are getting exchanged. Bitcoin doesn't help here. The same issue is with smart contracts.
And the best solution is actually PoS. Our current fiat system is not perfect but by far the most stable system we have.
And yes Bitcoin is also not suddenly fixing/solving inflation problems etc.