With the initial UGC tools we are likely to have, will it be possible to fail a mission? Likewise, will it be possible to "loop back" if your character fails at the task at hand (for example, when Q made you fight increasingly difficult Borg mobs). I'm thinking of a story where if you fail to save a key character you get some "you failed" dialogue and are placed back at the beginning of that battle to try again.
well from a writing standpoint...there are 2 different things when you say...you can fail
1. set a condition--- you blow up--if it happens the game kicks you out of the adventure, you fail.
or the thing your protecting dies ect...
I call that general fail
2. the more useful one --- multiple endings/paths
with this one you can have them fail --- one possible ending with aftermath, very nice
or multiple winning paths
or both winning and losing paths
all and all, I would prefer multiple paths and endings...it covers all bases.