Either there should be a way to withdraw from a league while your pod is still filling, or else there should be a ~15-minute pod-filling timer, after which an unfilled pod disbands (refunding entry costs). I'm currently sitting in the MP lobby regretting having entered Golden Shrine b/c my pod isn't filling at all. I really don't want to check back in 45 minutes and see if my pod did, in fact, manage to fill just before the deadline, so this is probably going to be 50 pizza tossed down a black hole. Oh well... >_>
I allready thought about that and here what was my conclusion: if unregistring from a league was allowed, one should not have access to the list of players in his pod by pressing on the standing button. Indeed, one could register, see that there are many 1700+ players in it, unregister and register again later till he can fin an "easier" pod. League standings of a registring pod can be replaced by something like: "Players 3/5" so that players can still know if the pod is about to be filed or not.
Ya, a way to leave a pod and refund the entrance fee needed to be in there. But it should not be on-demand. Otherwise it will be impossible to fill the pod up. A timer is probably the only choice. Once the timer is up and your pod is not filled up, will be given a prompt to cancel the league (you will not be able to join this league after that). Pizza will be refunded. The prompt itself need to be a timer. If you did not respond after the second timer is up, you will be put into the pod anyway, waiting for it to be filled up. And if you forget to play, all pizza is lost. Bringing up the pod list anytime should also tell you whether or not your podmate is currently on the prompt timer (the 2nd one) or not.