That would presume the directors would change every year. And I think it's very unlikely, absent a concern, that shareholders would vote to change each and every director every year. That seems quite unlikely.
The evil it is trying to rectify, which is that of entrenchment, where there are directors who aren't doing a good job, is probably more of a concern. You would have to wait three years before their tenure comes up for renewal. I think that's a bigger concern.
But absent a real concern about performance of a director, it's very unlikely that shareholders would ever vote to replace every director, because shareholders, obviously, are concerned about continuity as well.