It is not trivial. Of course a precondition is that term limits are absolute, that means no interruption nonsense. You can still have a sock puppet but legally that sock puppet is in power then. That is super dangerous for a fascist regime because betrayal is a real risk then. Putin was also super nervous about it, even if it worked out for him.

The main thing about those absolute term limits is however to add friction to the perversion of a democratic constitution. If voters are ready to accept it, it is too late anyway, but it makes it just a bit harder to justify the actions, while the constitution is not completely overthrown yet.