I think the key is ref involvement. Eddie said there are stall cards, I believe, but these must actually get used. The ref should be very involved in pushing the pace of the match. The difference between wrestling and jits, for aggressive action vs positional play, is the difference of how involved the ref is in pushing the action with stall calls. In wrestling I've watched heated matches lost in the last 30 seconds because multiple stalls were called on an opponent trying to just stall/survive while ahead on points. You must always engage in wrestling, always be working to better your position. I realize there aren't points, but getting DQ'd is the penalty. Though admittedly it will be real hard for the ref to make that third (or whatever amount it is) stall call for the DQ and will always cause controversy on the matches it's called or not called. It's hard because there is a purposeful slow art to jits in some situations that is different than wrestling.
You could do something where if the match hasn't made it to the ground after x mins, a coin is flipped and one opponent is started in guard. But then do you not allow that opponent to stand? only stand during sweep attempt? There are a lot of randoms there that would be hard to control and I think it might feel awkward to stop the match and force someone to start in guard. Could be something that changes the pace though, a TV audience will lose attention after 2 mins max in the same position.
Ultimately Eddie wants to keep the ref out of it though. Introducing more active stall calls or forcing guard pulls will again bring in a controversial ref involvement. Eddie's idea for the solution without ref involvement is with prize money for subs. No sub, no money. Right now that incentive isn't in play, but that is the goal and the current plan to encourage constant action. With that sub money not on the table right now, we can't really see how it will affect action.
btw, not at all saying this because I didn't enjoy the match between denny and nathan. Just offering a response to the topic of stalling or purposely playing it safe that Tim brings up.