I'm not saying you can't make it work (obviously you can) and I'm not even saying it's hard. I'm saying it's impractical for most people (because of high cost and added effort). Most people would rather use the ICE bike they already have (and are familiar with), for practical reasons. ICE bikes have virtually limitless versatility; there really aren't any fuel or range/destination concerns on most bikes, they can go anywhere, anytime, without any hassle. And given the current state of inexpensive gasoline..... Whereas you have to stop for hours at a time, at specific points in your journey's. I looked up charge stations just a few months ago, they are quite scarce in some places, so you really are tied to them, and are hoping that they won't be inoperable or otherwise inaccessible. I've also heard Ben talk about his journey's, I know that there are difficulties that wouldn't exist with an ICE bike. And then there is the cost... how much do the superchargers run? It's $750+ for an elcon, so I'm guessing it's 3k for a supercharger?
Personally, I'm not adverse to a little effort and expense (so long as it is comparable to the alternatives). I'll consider upgrading to a supercharger in a few years (assuming there's one compatible with the monolith upgraded 2013). But if gas is cheap (and looks like it will stay that way) I'd be better off, financially, getting a cheap ICE bike (or using a car or trike).
But there's also new technologies to consider... Batteries might not even be the future of electric transportation. There are folks working on super-capacitors that can store energy as we speak, and we already have spark plugs that convert gas powered vehicles into water powered.