Well, I think perhaps it will be more widely adopted if it gets FDA approval for use in AF. Right now it is an "off label" use and there is not a lot of long term clinical data on its use for this purpose and it is not covered by health insurance.
If we lived closer we could pool our resources and buy a bottle of botox and get it all done the same day. You have to buy the whole vial which is expensive because they can't save it once it is open!
(I bet my grandma has some old homemade jar of figs back in her pantry that has botulism in it for free, yuck!)