Not unspeakable at all. We're talking about a (few) hundred man-years, tops (probably less than that, depending on how strict you are). Ubuntu devs have mentioned in the past that Mir could have been finished with an extra $1M (which is ~ 10 man-years), but Canonical/Mark S. didn't want to invest that money into it.
So the whole Linux-on-the-desktop is extremely underfunded compared to any moderately serious enterprise project.
So the whole Linux-on-the-desktop is extremely underfunded compared to any moderately serious enterprise project.