Like many businesses, wedding photography has changed over the decades. Wedding photography a long,long time ago meant hiring a photographer to come to the church with a large plate camera, and to take a handful of photos as a record of the day and the newly married couple. At the height of the film era, the storybook type wedding was in vogue. In the 1990's wedding videos as "a thing" took off, with the newly emerging and fairly affordable and very good 3-CCD camcorder models that lowered the cost of decent video gear to under $3,500 for a camera and tripod and microphone kit. Now we're in a different era, one in which "photos" are no longer thought of as printed pictures in albums, but more of sharable digital files, photos to be uploaded to one's Facebook page, one's personal Flickr page, uploaded to a web page so people can be given a URL, a link to digital pictures, and so on.
The "old paradigm" was to get the job, then to sell larger prints and canvasses at high markups, and to deliver at least two very expensive wedding albums; in most cases, the majority of the market has moved on from that because that is simply NOT the way people are viewing photos or using photos or thinking about photos. Photos today are much more about immediately-accessible digital images...smallish to medium-sized .JPG files that look good on-screen.
A fairly substantial part of today's wedding photography with younger brides is the smartphone captures, the real, genuine, candid moments, the videos, shot by the bride and groom's friends and family members. Today's newer smart phones can take excellent quality candid stills and video, and the devices have the ability to easily, and for "free", make perfect digital duplicates that can be shared with the B&G and their family and friends. A group of six to ten young women with their own smartphones can easily generate hundreds of good wedding images, acting as a sort of blanket coverage photography team. These photos are almost never the ones the "pro" will get.
It's no longer about the quality of the camera that shoots the photos--it's about the quality of the moments captured. A one- or two-person professional photography team will miss 95% of the actual moments, the exchanges of genuine emotion, compared to a 10- to 150-person team with their smartphones. Again, it's no longer the 30 x 40 inch canvas that is the hook, the closer, the big sell. Photos are not the same thing they used to be even 10 years ago. Is wedding photography dying? No. But it is changing, and it has changed from what it was in 1910, and 1950, and 1980, and in the year 2000. The last time somebody asked me if she could show me some wedding photos, she pulled out an iPhone 6s.
In multiple ways, an iPhone or an Android phone is a much,much,much better wedding memory-grabber than a Hasselblad 500 C/M and a 50/80/150 lens trio ever was. The smartphone shoots video, has no 12-frame limit, has hyperfocal DOF, is silent, not loud, and is very high-capacity, and can shoot,shoot,shoot,shoot. Having 10 to 40 of those things at a wedding means that thousands of stills are available to the B&G.