The problem...
... (for me at least) with such compound approaches is that they both imply and, I would suggest, require my pre-approval of a level of data gathering that otherwise might be expected to require a warrant, and spread that approval over every organisation/ group/ authority operating the 'trust' model. For instance:
1: User is attempting to access an account from a previously used device
The user surely must, therefore, have agreed and accepted all those with whom he is being 'validated' are permitted to gather and or hold information on the devices she or he uses.
2: User is at GPS co-ordinates in the area of their home address.
The user surely must, therefore, have agreed and accepted all those with whom he is being 'validated' are permitted to both know the user's home address, _and_ to see the results of some manner of local GPS tracking at any time a validation request is made.
3: Audio match
The user surely must, therefore, have agreed and accepted all those with whom he is being 'validated' are permitted to hold one, or more likely a higher number, of 'audio fingerprint' samples. Which, of course, will be held totally securely and never leaked/ stolen/ misused. Well, probably not. Or possibly not...
4: Video match
See audio match, but add 'video sample/s.
So to 'validate' myself to any or all of a number of services, I have to agree in advance that they can gather and/ or hold all the above data on me, and presumably 'pass it on to others as required by local law'. And I have to decide this is a Good Idea(tm).
Not in this lifetime.
And yes - I know that 'certain authorities' may have all the above already. But at least I don't have to agree in advance that _anyone_ can have it, use it, and possibly leak it, misuse it, sell it or give it to someone else. And if the aforementioned 'certain authorities' try to use it, there is a small chance (even if not measurable by current technology) they get slapped on the wrist for doing it.
Of course, I'm probably talking nonsense. After all, I'm an Idiot... :-).