GIFs would be obsolete if there was a decent replacement.
SWFs were supposed to replace them, but they're going nowhere fast, heh.
WEBMs satisfy some of the same need, but not all.
Same applies to APNG (covering basically all the use cases WEBM is bad at).
Once we actually have reliable support for both APNG and WEBM across all major browsers, as well as in image viewers in the case of APNG, GIF will finally be obsolete.
(then we need to work on replacing SWF with SVG.)

@Klaue:
That's a preview-only bug, ignore it.

PNG exif: there are actually multiple ways to do exif in PNG. None of them are official, unfortunately.