I'm in a fairly similar situation - I'd been looking at R bikes for a while, but then electric vehicles caught my eye. One of the other factors for consideration in my case was that I hadn't been riding my ICE bike much over the past few years because it wasn't exactly the perfect bike for me and I was having back problems. Now that my back is on the mend, the R might be a better choice (smoother and lower maintenance than my single cylinder chain-driven DS bike), but I would have to be sure I would start riding more regularly to justify it.
In my case one of the trigger points, other than being more physically able to ride again, was that I started getting interested in Tesla, but it would stretch my budget a lot until they get to their 3rd generation Bluestar platform (though I did splurge on a reservation payment on one of their current models if only because I had the money sitting around and wanted to support the company - but when my reservation comes due in 2 years I hope to have won the lottery or done a serious bit of money saving). Soon after I rediscovered the latest generation of electric bikes that are getting just almost to the point that they could serve my needs (a near 40 mile mostly highway commute strains their current range budget, but I can work with that). Other than raw performance, I can preview my Tesla dream for a lot less money - though an R bike could still go on nice weekend getaway rides that the current crop of electric bikes is not yet capable of, I'd be reinvesting in petroleum.
So, R bike, used R bike, Zero, or wait for Empulse, or save my money for the Tesla dream - are all on my list to some small extent. My current best guess is that when the Empulse is announced in final form soon (or so they say), I'll be in a good position to decide between it and a Zero ZF9 and then I'll simply keep my old F650 for longer rides, though I'll have to remember to keep riding it so the engine doesn't gunk up from disuse like it did over the past 3 years of non-riding. Realistically, I'd probably have to force myself to use the F650 and I wouldn't buy it if I had the electric bike, but I'm also probably not going to sell it either.
My need for the ICE bike falls in between "spend money for one" and "bother with the pains of selling it for much less than it is worth to me and giving up that extra bit of utility"...