Re: Will multi-scale guitars take over?
Just like everything else on a guitar, multi-scale is a means to an end.
In this particular case, those ends are:
* More ergonomic positioning of the wrist (somehow subjective)
* Higher tensions on lower strings reduces requirements for thicker strings for equivalent tension, which could be a good thing
* Improved intonation
Then there are good and bad ways to do it... For example, Strandberg's 6 strings have a half-inch fan, with the nut being the parallel fret. This is not great since:
* It negates the ergonomics advantage available with a better fan
* It slants the bridge and pickups more than needed, which causes hardware incompatibility
To my mind, if going with a half-fan fingerboard, I'd think it better to have the parallel fret be the bridge. This keeps the fan on the low notes, which keeps the ergonomics advantage.
A 2-inch fan on a 6 string guitar like the Ormsbys is supremely uncomfortable for me. I think 1 inch for 6 strings, and 1.5 for 7 is perfect.
For 6 strings it gives two options:
* 24.5 to 25.5 for more vintagey tones (as per what Jeremy said)
* 25.5 to 26.5 for down-tuning, what I have on my Kiesel
* 25 to 26 would be a decent compromise between the two, but with a half-inch extra only on the bass, it wouldn't really be used for super-low tunings, hence a compromise isn't necessary for most use-cases I feel
(obviously what I mentioned is subjective and based on my own experiences)