"but to fear that it's suddenly going to shut down a bunch of popular sites overnight and we have to scramble to revert back to an /etc/hosts-over-ftp distribut

"but to fear that it's suddenly going to shut down a bunch of popular sites overnight and we have to scramble to revert back to an /etc/hosts-over-ftp distribution of addressing is silly" I'm more concerned that unpopular sites will be shut down. Or never created to begin with.