The "mindfulness" you write about is not "mindfulness" and has threads of addiction laced into your text. Mindfulness's goal or aim is not happiness. To assume it is, is an attachment from ego.

The future from the perspective of mindfulness is an illusion. However, since we come from ego, future is useful in the managerial aspect of our daily lives. The "secret" is continued work to let go attchement to the illusory future which can only be done for short periods of time.

Mindfulness is not detachment from thought or emotion or advocating dissociation as others have posted here. Mindfulness allows us to release attachment to emotion or though in the present moment.

When attachment is released completely for a time (let's say 5 minutes - an extraordarily long time in the mindfulness practice) a profound peace can be experienced. When we experience this there is a natural attachment that arises from ego. This is the crux of addiction.

When we return to the world of ego and attachment then we can utilize the memory of the mindfulness state to reduce suffering. Levels of anguish and /or physical pain may be there in us but our attachment to these states may be less and this is part of the mindfulness practice that is on-going.