I would love to see them give +1 commitment reward for completing either wood or bronze the previous week , +2 for silver/gold, +3 for platinum/mithril, and +4 for diamond.
I think that this reward structure would encourage more people to give wvw a try. Legendary armor would still take 22 weeks, but the time commitment per week would drop considerably. It would also put the focus more on "what have you done in wvw lately" rather than how many wvw ranks have you attained. For those that normally max out diamond chest, not only will they be able to do so quicker but the repeatable diamond chests will be obtained quicker as well.
It is high time that the only difference in reward for repeating diamond chest over the first diamond chest be skirmish tickets. A maxed out pip acquisition with Anets proposed changes and what I mentioned above would be 17 pips/tick. Even at 17 pips it would take 100 minutes to repeat the diamond chest. The 4 extra memories of battle and 4 extra mystic coins for each repeatable diamond chest would go a long way to making wvw gold per hour more on par with other game modes (at least until the price of memories of battle and mystic coins drops).