I don't think Thomas has an opinion on the "when". He's just saying it's being used that way. If it's being used that way, then it's still a good signal (in the markets where it is being used in that manner).
If it's actually true that we have crossed the point where it is no longer prudent for companies to segment their customers this way, then there are a whole lot of companies making unsound business decisions, and the problem will solve itself.
If it's actually true that we have crossed the point where it is no longer prudent for companies to segment their customers this way, then there are a whole lot of companies making unsound business decisions, and the problem will solve itself.