It's gonna sound snarky, but I don't think there is any crypto that is ready for "widespread usage" if by that we mean literally 100s of millions of users per day, doing multiple transactions each. ETH for example is sitting at around 1.2 million transactions per day nowadays, and Bitcoin half of that. Theoretically, ETH can only do around ~2.5M transactions a day. Not exactly ready for widespread usage either.

ETH 2.0 is theoretically capable of 100K transactions per second, but I'll believe it when I see it under real world load. That said, it's good to see ETH finally moving to PoS.