We already have such a system available, called Manjaro Summit: Manjaro Summit public Alpha now available
There the user will use arkdep to maintain the system. It is fully image based and uses flatpaks for additional applications. When there is an update, you can download it, but it only gets applied on a fresh boot of the machine. If that new update won’t work, you can select the previous state of the system.
Initial products shipping this style of Manjaro will be:
Most likely expected in Q4-2025.