I don't see a failure; this thread has gone silent for a month or two before and picked back up again. If there are enough people still committed, it can keep going. I should be able to come back and start GMing again some time in September, if you'll all still be around.
Might be worth putting in a time-skip to fast forward eveyone to the point of returning to Garden, leaving all the bits about how they got the airship and such for flashbacks and such. That way we can get on with the events with the Garden Master.