The Feast/Shatter is a great addition to FFXIV and I think adding a roullete for the feast that gives the same amount of rewards as a lvl 60 trial roullete would be great to help populate it more and entice players to try it out.
Also adding more weekly challenges on the pvp challenge log would keep it going as well :D maybe eso/pvp exp/wolf tomes/gil for 20 - 30 - 40 weekly games? Just a thought :D.