That's highly interesting, but also something I was already assuming. The term may indeed be too nerdy, geeky, or whatever. But that may just be a perception we have these days and it could change if people around Silicon Valley indeed invest more.
I believe that the image problem is less about it being too geeky or technically complex and more about the scams, hacks, failed exchanges and all the other negative associations with things like "the dark (evil) web" and so on. These have provided the media with sensational bitcoin stories in the past. All sorts of negative associations have been made and reinforced: use of terms like "the shadow currency", repeated assertions of it's use (or potential use) for money laundering... the lack of regulation (absence of a benevolent overseer) etcetc.
Now that the money men are coming around - as they realise that progressive technology can make them more money, not wanting to miss the boat, being somewhat led by the geeks in silicon valley who they no doubt have some respect for - it's not about the technological barrier, it's about this image/PR problem.
When bitcoin or bitcoin tech is making seamless solutions for all sorts of things, the tech can stay in the background, no one needs to really know about all that. What might also be required if these negative associations aren't gradually shaken out is that the name bitcoin stays in the background too. Unfortunately once an association is implanted in the brain, it takes quite a bit of effort to change or correct it.
Average Jane might see "bitcoin" and the first thing she thinks of is "shadow currency", "dread pirate roberts", "dark web" (and thus, child porn or organised crime) - once this has happened a bunch of times, her brain is wired to have that automatic response. Now you'd have to sit her down and carefully explain a new set of associations in order for her to see bitcoin in a new light. But then she'd also have to acknowledge that as truth and also consciously make some effort to think about these new associations a bunch of times before they become an automatic response and bitcoin becomes a "safe" word.
EDIT: I'm sure we all know this intuitively anyway, but it's something that shouldn't be ignored or hoped away. Either a dedicated PR campaign (as WSJ is basically doing), or a rebranding/repackaging.