I wouldn't hold your breath. Marketers can already do this to an extent on Facebook. FB allow targeting in minimum groups of ten emails at a time. For large companies it's easy enough to batch data groups of 10 for things like happy b'day or 'Hello George' type messages. Or to take it to the 1-1 level there was an amusing case of someone trolling their flatmate by uploading 10 email addresses, nine of which were girls and selecting the sub-targeting option of 'male only'. He then ran super personal ads to freak out his flatmate. FB may have fixed this 1-1 option now given the publicity.
Personally I don't do these type of comms in my marketing as people find it creepy. Nor have I seen other utilising this like that. I have used FB for targeting with generic ads so people don't realise they are being targeted at that level. It was quite effective. End of the day professional marketers are trying to get relevant ads in-front of relevant users and not waste budget with unneeded impressions/clicks.
All that said, I do see the potential for abuse on this. I kinda feel regulators need to step in and place clear guidelines for people protection, perhaps rules around PII (personally identifiable information) sharing between organisation which is getting very common these days to enrich each others data. Also in the same way many professionals are accredited, I wonder if people working across larger PII data sets should require accreditation. Something that ensures they know the rules, and if they are abused they can be removed from the industry.