Byepervisor did crack the hypervisor, but it requires an old version of the firmware and the console has to be kept offline to avoid being upgraded. There's no mechanism to downgrade the firmware like there was with the PS4, which limits the blast radius of potential jailbreaks.
Of course, even offline consoles can be updated, since games can ship with firmware updates required need to play the game.
I highly doubt this. The platforms that didn't have any jailbreaking scenes weren't because the devices were so secure; it was because there was not enough demand for it. If given enough time, there will always be hacks and bypasses just like Denuvo or hypervisor bypass like the recent hack.
It's completely possible that future consoles are secure enough that the components fail long before the security does.
If AI lives up to its promise then in 5-10 years it should be possible (and affordable) to just point an AI at the screen and let it clone all the graphics, then have it implement the engine.