I honestly don't know, specially because it seems that project will take quite a while to be delivered so, who knows where we will be by then? The safes thing we could assume is it might follow the trend of PLAY and PeerTracks. Those are the only projects we can use to compare with Identabit.
So if it was released now I'd say ~$2M max.
But knowing it will take long, who knows? If we are in the middle of a bullrun by then, brownies holders might just get a small lottery wining prize. At those times everything rises to ridiculous prices, people are irrational and just want to get money in, in hopes of not missing the ride so.. If by any chance this delivers in the middle of a bullrun and attains ridiculous prizes for a startup (I'd say $10M would be a lot but wouldn't surprise me in that situation), then whoever gets sharedropped will get a small prize.