Kierkegaard suggests that we're depressed, in modern times, precisely because we're trying to live in the present moment: we have emptied the past and the future of all meaning. "Everything is cut away but the present; no wonder, then, that one loses it in the constant anxiety about losing it." In these conditions McMindfulness is more likely to exacerbate depression than to relieve it. Relying on the present moment to supply all our meaning was already overloading it: piling more on is not likely to help.
I still think most people will need mindfulness practices (very broadly construed) to have a life worth living. But I've joined the rebellion against locating the present moment as the place where reality lives. There's a lot of reality. Some ways of reaching out to touch it are historical, and some are soteriological. The fact that "we look before and after" is a feature, not a bug. Sure, it can get us in trouble. What can't? Man is born to trouble, as the sparks fly upward.
A quiet Fall day.