The End of Tenure in the US?

Tenure, RIP: What the Vanishing Status Means for the Future of Education  is an article in the Chronicle of Higher Education. While the tenured to nontenured faculty ratio is larger (than the average figures from the article) in the hard sciences, one cannot help asking whether in the years to come (and how soon) the tenure is indeed going to become a rare perk rather than a common standard, and whether the dichotomy tenured vs. nontenured faculty will be more or less equivalent to that of research-intense vs teaching-intense faculty.

What do you think?