> anything covered by Denuvo is unavailable even years later
I don't think this is true in the general case.
> Either nobody is willing to crack it (unlikely)
That's exactly what's going on - it's a matter of time-benefit, not "possible." What's groundbreaking with Denuvo isn't that the overall technique is incomprehensible but rather that it's insanely tedious to remove and very difficult to automate. They haven't made some groundbreaking theoretical technique, they've applied so many "standard" ways to obfuscate a binary that it becomes more annoying than it's worth to remove.