Death of the TV household ?

Once upon a time, TV advertising math was simple: one household equaled one TV set. Back then one contact with 1% of all TV households in the country represented 1 GRP (Gross Rating Point) (reach 1 times frequency 1). People used to watch TV on a main TV set, in their living room (or family room), and they watched mostly live TV (since TV was linear).

That time is past.
Most households nowadays own many TV sets and DVRs; moreover, they watch TV on many devices, some of which are mobile (computer, tablet, smartphone). And they watch out of home, they time-shift, they binge...
Today, comScore (with recently acquired Rentrak) intends to replace the notion of TV household with that of TV device. In fact, according to comScore, there are now, on the average, more than 12 devices in a home. Young generations watch TV more on mobile devices than on a TV set.

So, for marketing purposes, instead of using TV househol d audiences we will now use audiences and data from devices, including streaming devices when it comes to connected TV.
TV as a single, simple category is no longer relevant. Each device corresponds to and produces specific types of viewing behaviors, behaviors which remain to be precisely analyzed, differentiated and measured for better targeting. In the long run, however, more than the device, artificial intelligence only will make the difference, not the device, also says Google CEO. This might start another phase of advertising history...

The death of the TV household introduces a new set of variables into marketing. TV is plural: it must be analyzed and explained simultaneously, from a plurality of viewpoints (“Vielseitigkeit ”, Max Weber). In addition to the sociology of TV choices (adequation of people with programs), we should take into account two other dimensions: the sociology of equipment (devices) and the economy of consumption (free TV, pay TV, bundles, subscription, pay-per-view). 

How will this affect the relation to advertising?