I think that even if electronic voting devices are not guaranteed to be failsafe today it does not mean that they can't get there.
Paper ballots are not an optimal democratic way of conducting voting. The whole process is time and resource consuming and disenfranchises the less privileged.
If there would be a cheap and safe way to cast electronic ballots from one's own phone I bet engagement with democracy would be a lot higher, not only on big issues like presidential elections, but on smaller stuff that one would vote at a local level.