Revamped Incarnam won't save wakfu, especially since you can just skip it. Mystery box sales won't save wakfu. Ogrine sales won't save wakfu.
Basically, what I'm trying to say is: you can't save wakfu if you don't put effort into it. You're trying to save a game by spending the least amount of time and resources that you can. It doesn't work like that. You end up wasting more effort with all these random updates that no one wanted than if you had just worked on what you promised, what people asked for from the beginnng.
Even IF you manage to get a few new people to play, it won't mean anything if you can't get them to stay.