When you "hope for a better reality" you suggest that reality is something that happens to you, which in Zen terms (of which this article mostly is) isn't the case. It's more like something you "happen" to yourself. Since you are it.
That being said, if it is your desire to play the game (as it is mine at present), then yes, looking forward and planning for the future are important. Experience points must be gained to get to the next level; missions must be completed ;)
Kind of like children. They are our future but they exist now, in the present moment.
One can imagine an abstract model of a concrete physical object (e.g. a lever; a geometry; a count of objects) and then ignore the concrete reality, and become so fully immersed in the abstraction that one loses track of time. I suggest that this is a form of mindfulness. Thinking about an abstraction is not necessarily mindful: it can be done in a non-mindful way by being constantly distracted by other concrete objects or other abstract models. Mindfulness is flow.
The "future" is a abstract model, and so the above also applies to it.
For human beings, these imagined interior worlds - be they abstractions of objects or of the future - as just as much a reality as the physical world. I suggest that we naturally and instinctively apprehend them in the same way, and both can be done in mindfulness - or not.
To concentrate on an abstract object is basically the opposite of mindfulness, as you're ignoring your current experience.
However, I'm just restating my comment. I'm happy to agree to disagree with you. :-)