I am concerned about the power it will give old leagues. If you were to cap the amount of contributions from each individual member then this would make it more about team work and less about two or three strong players.
I do love the idea of more safe levels. Every 5 would be great. Beacon imbalance is a consern though as you become a target the minute you get to level two or above. Rising to level five is impossable for a young league. I do not believe that this feature will help that.
For good game play we need a mix of defencive and offencive play. This change tips the scales too far to the offencive :-(