Logical (suggestions, which you asking for) would be to reward managers who perform in present, but also, we shouldn't pass over those who perform at WC 1 year ago. All depends in which measure!
However, I will give more credit to the present, logically
Only 4 managers from the previous WC, even if they were the best of the best, seems too little. Even 12 out of 156 it's a disdaining thing concerning our noted managers. I would add more managers of the previous WC, but without being directly qualified, because present is the one that counts. We'll grant more places for they, as a sign of respect, but not before they're proving once more, the form and the quality.
Another thing which it's due to be improved is that from the Semifinal stage should to qualify more managers to the Final. I think that those who have succeeded to reach the Semifinals, deserves more chances to reach the Final, too. So, a Final league with more teams, if the schedule allows and such a league is possible, and with a little bit effort would be! Something new and original.
Therefore, I propose a WC with 168 managers, with 36 managers from the previous WC, which means only 22% of amount.
So, 168 (total) - 36 (managers from the previous WC) = 132 ; 132 available places for the managers of the actual year, compared to 144 places from previous year. Not a big deal.
- 1st round: 14 leagues of 12 managers (Best 3 goes to next round and the six best rated 4th places)
- Semifinal: 4 leagues of 12 managers (Best 5 goes to next round)
- Final: 1 league (new and original, as I said ) with 20 managers.