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I use a fallback on the Kindle side (because older Kindle readers don't support SVG), but not on the EPUB side. SVG support is required for full EPUB spec compliance (even in EPUB 2), so as far as I'm concerned, if a reader doesn't handle SVG, the reader is hopelessly broken.
Experimentally, all mainstream EPUB readers handle SVG. I think I encountered a couple of old, semi-defunct readers that didn't handle SVG, but they mostly still rendered the text as block-level elements, which worked well enough for my purposes. Either way, they're lost in the noise.
Note, however, that there are a fair number bugs in various readers' SVG support. I've documented the various fix-ups that I perform on the SVG content over in the CSS and HTML tips section of the EPUB wiki page.
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