I've been getting ads in my facebook feed for weeks now for a software that does this.
Flixel
I looked at it and thought, 'oh that's cool' for about 2 seconds and then I was bored. You guys really think there will be demand for it? Feels like a gimmick that will lose impact very quickly.
I think there will be, more for social and perhaps website front pages.
I still think the still image for print is the main deal and what is most important to get right. However, the creative briefs I am seeing from agencies all have some sort of cinemagraph added in for social. Most of the time, they are handling the post in house, but it would be important to have the files to make it possible.
Personally, just like most picture, most cinemagraphs really don't catch my eye beyond the initial few seconds, but most are not being well produced or are too gimmicky.