Honestly the only way the Tebow gimmick has any chance of working is if they line him up on every play; the main failure of the whole wildcat thing on the professional level seems to be that they always seem to have a designated "wildcat" QB or someone they bring in specifically for that play, which pretty much lets any 3 year old see it coming from a mile away. So if they had Tebow always lining up at like HB or FB, at least that's keeping the other teams guessing to a degree, regardless of how many snaps he does. But of course, that means sacrificing some other position to one potentially of weakness, which just doesn't work that well...
And I doubt they'll ever start Tebow except if/when Sanchise gets injured, as they've invested too much money into him to just simply go to Tebow without a pricey divorce somewhere. Really, the Tebow thing was pure publicity, and to that effect it's working great, they already got Nike and Reebok squabbling again over jerseys before one lost their licensing agreement with the NFL.