Just be glad they're making new 'poppy' music. If they still made albums like Parachutes and AROBTTH they would slowly have become less important in music industry and even could have quit.
But what they did after X&Y was for the band the perfect thing to do, change themselves and make music they want to make and feel good about, that's why I think they're still at the top, after 16, yes, 16 years.
You may or may not like AOAL, but we all know Coldplay too damn well and we can say even before the release of AHFOD there won't be another song sounding like AOAL. Coldplay is a band who can make music in every genre but still sound like Coldplay.
Also, Chris said this would be the end of a story, like the Potter series. What my meaning on this is that after AHFOD w have three trilogies with albums which are a lineup in sound and style.
and then there's Ghost Stories as an exeption because they just had to make that one before continuing. So we can expect anything after AHFOD. My guess is a return to their old sound. Because we have had their midlife crisis then and they will go back to their old days.