Ok, here's my turn:
1) normally people just get accustomed with the "usual taste" (shape) and feels kind of highly uncomfortable in accepting a change, even if there's a real, sensible advantage; go figure if the advantage is barely perceivable or only "psychological"! The change, if implemented, will be completely "absorbed" quickly (I think): just remember how "ugly and totally unacceptable" the Sting Ray headstock "felt" when the bass came out on the market! Think about the world without it now!!!
2) the 2+3 objectively offers some advantage, some extra "breath" to the low B but also (unquoted up to now)...
3) ...less-string-beyond-the-nut for the G (and D) as well!!! And this might give to the G (and D, too) another new "flavour" and feel under the fingers: Gary Willis clearly states that he never liked the Fender strings configuration because the G feels too "stiff" (his respected opinion!!!) so he set for his own 2+3 optimal configuration (after Mike Tobias precious input, anyway!) that both solves the tighter B feeling and the "better singing G" at the same time
4) the 2+3 would be highly desirable, specially on the Ken Smith more traditional headstock (MVVHO, obviously) because this headstock design is the one that suffers "more" of the B closeness to the nut on the market. I mean: if you look at the Lakland headstock, it clearly derives from the standard Fender 4 in line (therefore supposed 5 in line or 4+1 for the five strings) but for his 5ers Lakin simply "aborted" the B too close to the nut position for an almost Fender-traditional long headstock with the 3+2 (introduced by G&L first, anyway!)
Another headstock that might greatly gain by this 2+3 "switch" is the Warwick headstock
To say it all, I frankly always wondered "what are these Smith and Warwick guys waiting for!!"
;-)
In addition, the Warwick should also go thru another intelligent move, that Ken made already, in intelligently redesigning his headstock, narrowing the top headstock part, so to keep the strings as close togheter and in-line with the nut slot as it is possible up to the tuners posts.
Ok, my english is terrible sometimes but... the matter is complex and highly subjective!!! (Bill Evans was used to say that the words are the children of the thoughts, go figure the translated ones!!)
My 2 euro-cents!!!
V.