Pretty much true -- but Dr Kildall's company was huge in its time, its product dominated the infant PC industry, and of course dictated the design of MS-DOS 1.x. His influence was great. Nelson's work _inspired_ the biggest technological development of the last 30 years, but it never shipped, and what we got is a pale shadow of his idea.
Nelson is a good example to keep in mind of the headwinds against "Crazy New Ideas" (https://news.ycombinator.com/item?id=27061789 on the front page now). Be one of the first in the world with a historically great idea, bet your career on it, and you still may not end up with much credit. (I'm not claiming he deserves all of the credit.)
I actually happened to get a personal demo of Xanadu from Ted himself a few years ago. While it has some clever ideas and clearly was ahead of its time, they weren't really able to execute on them in a reasonable timeframe. The web won because it shipped.
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[ 5.6 ms ] story [ 21.0 ms ] threadHe deserves more respect.
http://habitatchronicles.com/2004/04/you-cant-tell-people-an... gives a taste of what it was like before the web to try to explain the potential.