I would humbly suggest the following:
1) Two groups of four in which each team plays the other teams once (three games in total).
2) Thereby Group A would consist of the previous years winner and the teams that came fourth, fifth and eigth in the previous competition.
3) Consequently, Group B would consist of the second, third, sixth and seventh placed teams of the previous year.
4) The playing schedule would be something like:
Round 1: 8 vs 5, 4 vs 1, 7 vs 6 and 3 vs 2
Round 2: 1 vs 8, 5 vs 4, 2 vs 7 and 6 vs 3
Round 3: 1 vs 5, 4 vs 8, 2 vs 6 and 3 vs 7
5) Round 4 would be a sort of semi-final day: A1 vs B2, B1 vs A2, A3 vs B4, B3 vs A4
6) Round 5 would than sort out the exaxt positioning for next years tournament:
For position 1 and 2: winner A1/B2 vs winner B1/A2, for position 3 and 4: loser A1/B2 vs loser B1/A2, for position 5 and 6: winner A3/B4 vs winner B3/A4 and finally for position 7 and 8: loser A3/B4 vs. loser B3/A4.
7) Round 6 is a play-off between a lower tier nation and the team that lost the game for position 7. This game could be played at a later date which is not directly linked to the 6N-tournament.
This format would see the established teams play five games, as they did until now.
It would also allow some teams, like Georgia, who have been on the brink of growing for a while now, to finally get some regular, competitive matches against larger opposition.
It would give the home nations a certain amount of security, while still giving lower teams a needed incentive to grow and invest.
It would bring the game to a larger audience.
It would give the game a true set of finals. This would spare us the annual discussion about how team a had an advantage because they knew how high they had to win etc.
Super saturday could be split up on two days.