There's a substantial core of truth in his article. The structure of land owneship in the Highlands and the uses to which the land is put are hardly conducive to benefiting most of its' inhabitants. There's room for more diverse farming, deerstalking, tourists and more people: the balance is all wrong. And it is most certainly the long-term consequence of ethnic cleansing and a subsequent land-grab. That's not to say that living under a clan/tribal system from subsistence agriculture was a great life by any means, but at least it was some sort of life. Whereas now, hardly anyone lives there, under what is essentially just another feudal system.
In the South (which isn't exactly Utopia either), we generally have to accomodate other land users when deerstalking. Certainly when I'm shooting woodcock, I adapt my timetable to try and avoid others (easy enough, the hours are unsociable), but I often meet ramblers, dog walkers, riders, cyclists, foresters, etc.
At the risk of sounding like a hippie, why can't we all just get along, Man?
I understand that the landscape, climate and ecology of the Highlands doesn't lend itself to intense use and dense population, but it can fit more people and uses than it does now. Of course, that would require another land-grab...