At the risk of being somewhat provocative, I suspect the older form, the TLM will become (at least for a while) the "grown up Mass", while the Novus Ordo, still reverent and sound in so many ways, will be lighter, less challenging.

The analogy of a parish having a children's Mass and a solemn Mass on a Sunday limps terribly, but it is close to what I am getting at.

Think of how St. Paul speaks to his beloved spiritual children who are being fed milk by him because they are not ready for "solid food". Get my drift? This would not mean that the Novus Ordo is bad (and that is what some trads will conclude from this analogy - and they would be dead wrong and will have missed my point). Think of it this way: little children need food for children. They don't benefit from what the adults should eating… yet. They are not little adults: they are children. Children aren’t defective. You don't put a rare T-bone in front of a 1 year old. That is not what he needs. You don't give pureed carrots to an adult, unless his jaw is broken or he is ill. Unless he is, in some way, defective. Once people grow up, they normally stop wanting baby food. They can survive on it for a time, but they won't thrive.