SVG isn't going away soon (SMIL svg markup may be though, so I wouldn't animate via that). SVG in some ways has come into it's own with things like mobile, where low size images are wanted, especially for things like logos.
Personally, if you want to use something like Illustrator and be able to manipulate images, especially if you may at some point want to animate parts of the image, I would go with SVG. There's various libraries for it, and Snap.svg and svg.js are 2 of the main ones (with d3.js being the one if wanting to do graphs and charts).
If you are passing around images for development to other graphic designers etc, I would stick with SVG at the source. You can always use fabric.js with exported SVG later if there is some specific reason for it.