When you look at what crypto protocols actually need to tackle, quantum computing might just be the elephant in the room. Sure, there are scalability issues, gas fees, and all the usual stuff grabbing headlines right now. But if we're thinking long-term—real long-term—the quantum threat is arguably the heaviest lift any protocol will face. It's not a problem you fix with an upgrade or two. It demands fundamental rethinking of cryptographic foundations. That's the kind of challenge that'll separate projects that get serious about it from those just paying lip service.