Don't think this will happen? Computers once used 5" floppy disks, with a drive for same generally plugged into the computer. Apple dropped the 5" floppy. Now, no computers use those things.

Then, computers used 3.5" floppy disks, with a drive for same generally built into the computer. Apple dropped the 3. 5" floppy. Now, no computers use those things.

Then, computers used optical disks, with a drive for same generally built into the computer. Apple dropped the optical disk. Now, very few computers use those things.

Then, most laptop computers once used small joystick-type thingys instead of mice. Apple went to the trackpad. Now, no computers use those joystick things.

Most computers use wired keyboards. Apple started manufacturing wireless keyboards. Now, more and more keyboards are wireless.

Once upon a time, a computer mouse could do two things - point and click. Then came two, three, four and more button mice, and now we have the wireless, rechargeable Magic Mouse, which supports a myriad of gestures.

Once a mouse/trackpad or keyboard were the only means of communicating with a computer. Now, Apple computers have Siri built in, meaning one can use voice commands for many procedures. Wasn't long before Google and others came out with their own voice-command systems.

Once, all you could do with a telephone is to call someone. Then came the iPhone, and now we have compact, incredibly powerful hand-held computers that also make phone calls.

Once, earphones were large bulky devices that had to be plugged in via a wire and quarter-inch jack. Then came micro jacks, and now Apple has created wireless earbuds, and others have hit the market.

Music (iPods), video (Apple TV and streaming, several file formats for storage) all these are now standard, and Apple led the way. AND, you can watch your video content on multiple devices.

Once folks said tablets would never catch on. Then Apple released the original iPad, and now dozens of companies make tablets. Some are becoming so capable that they've eliminated the mouse/trackpad, made it possible to do without paper documents, and so on. And with a keyboard - digital or physical, some are using tablets exclusively instead of laptops.

Apple doesn't always do things first, but they generally do things best, and the thing is, when Apple says a format, device, or the like is obsolete, it has eventually been accepted.

HEIF will be no different. As has been said, there are billions of JPEGS out there, so it is not likely that computers will be built that won't accept them. But then, nearly every digital camera manufacturer has its own proprietary RAW format. Not all are recognized by all software packages, unless said package is updated, but Adobe has a very nice, free, converter that'll change any RAW file to a DNG. Methinks we'll see the same path with JPEGS.

And, I gotta tell ya. I operate a photography website - I sell/license prints, etc., and anything that'll make my web pages load faster WILL be appreciated.