I think it's 2 problems. So Lucozade was originally Glucozade and marketed more as a health tonic. 500ml had 62g sugar, so handy for a quick glucose hit. Then rebranded as a sports drink, and still handy for a glucose hit. Unless of course your body doesn't really need it. Then it's just like other soft drinks, energy drinks like Red Bull or alcopops where the high sugar content can lead to obesity.
T'other problem is the reformulation, so new Glucozade is 22.5g per 500ml, and that isn't as useful for hypos, and doesn't seem to have been communicated widely enough. And also means Lucozade won't be as useful as a sports drink for anyone who really does need that quick glucose boost. And the issue's going to be industry wide as manufacturers reformulate to avoid the sugar tax. So that means finding hypo-fixes now, rather than trying to read the small print on bottles, cans or cartons whilst losing consciousness, as Proto points out.