Actually, I think it will. Yes subs and boomy ness will still be popular, but sound is doing nothing but increasing in quality, and if one end of the spectrum will become clearer, IMHO, the whole will.
Unfotunately I don't see anything good happening at the moment in this regard (Speaking of stereo gear, not of bass amps).
Probably the biggest enemy of getting good low bass on recordings, though, is compression. Everyone wants to maximize the average volume of their records, and unfortunately they do it at the expense of the headroom which should be there for the bass.
Of course, people don't like the sound of music with not enough bass. What's happening is that they're compensating by boosting the bass that IS still there. Compensating for low with loud.
Live music tends to be even worse. I've never understood the reasoning for rock concerts being so loud. In most cases they could probably be down 15-20 dB and be plenty loud to drown out the crowd.
Think about how much better the bass could be with that much lighter load on the amps/speakers.
Of the last half dozen concerts I was at, only one band had the bass at a relative level where I could hear it clearly (most you couldn't hear if you tried), and I'm fairly certain it's because their overall volume was lower than all the other bands playing that night.
Anyhow, I'm getting off topic. My point is that when even an E string doesn't seem to be getting through at 40ish Hz how is a F# going to get through at 23?
-Nick
Edit: And to clarify, I'm referring to the original question of whether it will become mainstream, to which this is a significant factor. I've thought about getting some fat strings and trying it, I just don't think it's likely to catch on in a major way.