New answers tagged multi-factor
I just did a similar search across some name registrars and it seems that Name.com and GoDaddy both support 2FA, the former using the Verisign/Symantec VIP and the latter using SMS for US numbers only.
Google two factor authentication supports the use of one time passwords. The user is supposed to print off the list (contains approximately 10 one time use passwords if I recall correctly) and keep them in a safe place, in the event the scenario you described above takes place.
What I can say, generally, is that you should not have a single point of failure. Be it your mobile phone (can be lost, damaged, stolen), some other computer or device (can be damaged), a piece of paper (can be lost, damaged) or even your memory (can forget things, especially if not used too often). Just like passwords usually have fallbacks for recovery ...
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