Just realized it would be way better if the scene starter had incentives to have others' agendas come up. So for each successfully completed agenda other than her own, she gets a chit. Actually... for each raised agenda, completed or not.
Also what do we do to prevent players from simply saying their agendas out of character? Two possibilities. One is all agendas are explicitly things other people do so if you say it it's obvious. The other is some kind of voting thing. Put it on the list of things to consider. (Obviously you can just say "it's cheating" but what's the procedure then when someone 'cheats'? It can't be "stop playing" or there's incentive to do so when behind...)