That wouldn't eliminate the need for manual recoveries; it might even increase it as people lose their second factor. 2FA would be nice, but IMO the email notifications provide many of the same benefits, so it's not high on my to-do list.
This is the reason why I think it is unlikely for 2FA to ever be implemented on bitcointalk.
There is a lot of commerce that takes place on bitcointalk, however, a bitcointalk account is intended to be used for
discussion. So the types of verifications that 2FA provides is better done when trading, rather than when logging in. There are sometimes occasions in which someone will legitimately lose access to their private keys, and the market can decide how to handle these situations, which will typically be that the person will need to earn trust subsequent to losing their private keys.