You think that our grandchildren will be shocked by sugar, something that has been in use for hundreds of years (and that's just refined sugar, not counting natural forms)? Not very likely.
Seeing some "coffee" products sold I feel there is certain line involved. And we are clearly over it. 100-200 grams of sugar in single drink. I think some sort of limits might reasonably be in order with those outliers.
Not that limited use isn't reasonably fine.