A slightly disheartening tale of NTP's possible future: <http://www.informationweek.com/it-life/ntps-fate-hinges-on-father-time/d/d-id/1319432>.
(via MetaFilter, which has a few decent comments on the matter: <https://www.metafilter.com/147900/NTP-or-Not-NTP-That-is-the-question>)

cheers,
 Stewart