As someone from the US who has watched our soaps die a slow painful death I find an article like this on the British soaps almost hilarious. Coronation Street, Emmerdale and East Enders all get over 30% share of the audience in a world where everyone has 200+ channels, Netflix, Hulu and DVR. To put that in perspective Empire which here in the US is a run away hit and has had ratings like the 4 broadcast networks haven't seen in years had a 5.8 ratings share, if our soaps got ratings like that we'd still have 12 soaps on the air instead of 4. Second from what I've seen the the pie is shrinking for tv audiences so the total # of viewers has gone down but their share of the audience has not, so again there is no real cause for alarm.
Another thing is the British networks seem to be committed to their soaps and realize their importance by investing in new sets, keeping their quality and giving them the prime time spotlight that they deserve. I think now the US broadcasters are starting to realize they made a mistake, ABC canceled All My Children and One Life to Live they thought they'd save money by replacing them with talk shows, but the talk shows failed and were not able to get the type of ratings AMC and OLTL could produce even in their final days. Plus most of ABC's primetime line up is nothing but soapy shows like Scandal, Grey's Anatomy and How to Get Away with Murder. If ABC had invested in AMC and OLTL like ITV and BBC do with their soaps they'd both still be on and in great health.